Firefly now generate low res 4 images then we upscale the one we like!!! but...

So firefly can now generate 4 low res images an we can upscale the one we like, which is faster.

Now technically firefly is using less computing power to generate those low res images, then why adobe is still charging us 1 credit per each prompt? It should charge us 0.5 credit for each prompt for low res images, but when we upscale, it can charge us 1 credit for each upscale.

Don't tell me the speed and stuff for low res images! I get it. but its still a steal for adobe.