Nobody seems to care about the battery life regression that the new MacBooks bring to the table. The 13" M1 MBP has 17 hours web browsing battery, while the 14" only 11 hours. This is a big difference. I have the M1 MBP since May and battery health is still on 100%. Battery life has been amazing. Since I am not a "Pro" (video, audio editor) I don't really need all the power of the new laptops. The only thing I want though is the new Promotion display with native 2x Retina scaling. This is the only reason for me to get the new MacBook Pro. If Apple put this display on the 13" I would get that instead.
I'm going to test out Low Power Mode on my MacBook Pro to see if that provides an extra 20-30% battery life.
I'm coming from a 2014 MacBook Pro 15 that's rated at 8 hours but realistically provides 5 hours (it has a brand new battery). So a battery rated at 21 hours is going to be a huge boost for me assuming that it actually provides about 17 hours of real-world use. I also am going to mainly use it for videos, web browsing and reading books and articles. Nothing heavy for now. I might integrate it into my workflow but I wanted to get a mini Pro or Max for that.