At 2.12 and 0.95 cu.ft for the Audi and Jag's frunk respectfully is a non-issue for the Lyriq not having a frunk. Maximizing the back trunk space as what the GM guys are saying for the Lyriq and the reason why they did it that way by-passing the need for a frunk sounds like marketing BS, until you realize that Audi and Jag's frunk space is nonexistent...   To which GM's words then kinda make sense as the Lyriq does in fact offer more room back there.   Frunk space is kinda expected though, for EVs, so there is that... Tesla Model X for a comparison as Tesla is the benchmark....   https://www.tesla.com/ownersmanual/modelx/en_us/GUID-91E5877F-3CD2-4B3B-B2B8-B5DB4A6C0A05.html     Cargo Volume Table 1. 5-Seater Cargo Volumes Area Volume (liters) Volume (cubic ft) Front trunk 183 6.5 Behind first row, second row folded flat 2,410 85.1 Behind second row 1,050 37.1 Maximum total cargo volume with driver and front passenger 2,593 91.6 Maximum total cargo volume with 5 passengers 1,233 43.5 Table 2. 6-Seater Cargo Volumes Area Volume (liters) Volume (cubic ft) Front trunk 183 6.5 Behind first row, second row in max cargo position, third row folded flat 2,431 85.8 Behind second row, third row folded flat 935 33 Behind third row 425 15 Maximum total cargo volume with driver and front passenger 2,614 92.3 Maximum total cargo volume with 6 passengers 608 21.5 Table 3. 7-Seater Cargo Volumes Area Volume (liters) Volume (cubic ft) Front trunk 183 6.5 Behind first row, second row folded flat 2,314 81.7 Behind second row, third row folded flat 957 33.8 Behind third row 425 15 Maximum total cargo volume with driver and front passenger 2,497 88.2 Maximum total cargo volume with 7 passengers 608 21.5       The Lyriq's cargo space is plentiful and it would seem like an engineering choice to favour rear space over the use of a frunk.  Is it a sound engineering choice? Possibly yes as the powertrain bits need not be crammed.   Is it a sound MARKETING choice? Time will tell as many folk really dont understand engineering choices all to well...   Nor do they seem to care.  If they want a frunk, they WANT a phoquing frunk... 

Lyriq Chief Engineer, Jamie Brewer, recently explained to GM Authority that the team decided to prioritize rear cargo space over two separate cargo areas. Thus, the 2023 Cadillac Lyriq will have a larger traditional rear storage area. In fact, according to Brewer, that enables the Lyriq to boast the “largest cargo volume in its competitive set.” That made us wonder what, exactly, is the Lyriq’s competitive set. According to Cadillac spokesperson, Katie Minter, it consists of the Audi e-tron and Jaguar I-Pace. “Lyriq is aimed at customers that are looking for a luxury SUV with outstanding styling, ride and handling and seamlessly integrated technology. In this instance, we’re looking at vehicles such as the Audi e-tron and Jaguar I-Pace,” Minter told GM Authority in an emailed statement. So then, Lyriq has a maximum cargo volume of 60.8 cubic feet behind the first row seats and 28.0 cubic feet behind the second row. When compared to the Audi e-tron and the Jaguar I-Pace, the Lyriq does offer more space in the back. 2023 Cadillac Lyriq Cargo vs. e-tron I-Pace   Cadillac Lyriq Audi e-tron Jaguar I-Pace Rear cargo volume behind second row (cu. ft.) 28.0 28.5 25.3 Rear cargo volume behind first row (cu. ft.) 60.8 56.5 51.0 Frunk cargo volume (cu. ft.) N/A 2.12 0.95 Total front & rear cargo volume (cu. ft.)* 28.0 30.62 26.25 * With second row seats upright However, both the e-tron and the I-Pace feature frunks (2.12 cubic feet in the e-tron, 0.95 cubic feet in the I-Pace respectively), allowing the e-tron to have slightly more total cargo volume (combined frunk and rear cargo area). https://gmauthority.com/blog/2021/05/heres-why-the-2023-cadillac-lyriq-doesnt-have-a-frunk/  

That's probably a better worded way to put it. It's a missed opportunity.  They're all liquid cooled at this point and I can't imagine Ford and Tesla are having battery cooling issues, at least I haven't heard of any yet and I've watched a fair amount on the Mach-E and know somebody with a pair of Teslas in Nevada.  I don't believe lack of cooling has ever been a factor in an EV catching fire. It's always something shorting and sparking with poor connection(s) somewhere.  I'd also like to learn why. They have to have a good justification, I know they're not a bunch of idiots who "didn't think of it".  I just don't want the press release answer of "we needed the space for packaging". 

Hummer EV (and Silverado EV) are much bigger and truckular...so they have a lot more space underneath for the dirty bits.   The Lyriq isn't a high riding 4x4, so it has to use space for the electric motor(s), power brake system, HVAC, radiator, etc under the hood...

Ive read that the Lyriq has a 5 link suspension system front and back.  Maybe that suspension set-up limits the space for the Lyriq?