There should be ATX PSU support... According to dimensions it should fit, but cables should be harder
Keep in mind, there is a main power plug sticking out one end, and then al the cables out the other... SFX-L is supported, but recommended against for cable clearance issues, going full ATX will only make that much much worse....?
Why is ATX PSU support needed? Surely most hardware can run on current 750w SFX PSUs and upcoming 850w+ PSUs?
Don't forget the Silverstone 1kW SFX-L PSU...!
1. Lower price (SFX PSUs are expensive, sometimes even scalper prices)
2. More wattage (For special use cases, but again it's still an option)
3. Always in stock (High wattage SFX PSUs are out of stock most of the time)
The quality SFX PSUs are Platinum-rated, so worth a little bit more...? But I feel the "scalper prices" is more a supply & demand thing right now...? Not a lot of supply because of the global pandemic, but when the supply chain is back on track, pricing should return to normal...?
Most SFF is ITX & single GPU, so wattage is not a huge issue; but we have 750W Platinum SFX, rumors of a 850W Platinum SFX, and the 1kW (that's 1000W...!!!) Platinum SFX-L PSUs...
Plenty of power for the most demanding of SFF rigs...?!?
Differentiating that higher-wattage PSUs are out of stock really isn't saying anything, those are the PSUs folks want, so of course the lower-wattage units are in stock, no one needs them...!
All in all, right now is kind of a bad time to be a SFF Enthusiast, due to uncontrollable supply issues & massive demand for components...!