That is funny. I had rMBP 13 2012 with 8GB RAM/128gb ssd for 8 years, there were only few times when i saw a beachball or had the system lagging. Overall when lagging, i was tracking the activity monitor, so 99% of the time I just had CPU (dual core only) maxed out at 100% use which obviously created slowdowns if ever. My RAM was always sitting between 5 to 7 GB. It has Sierra on it. My RAM pressure is green.
Currently, with M1 Air 8GB/512GB on Monterey, 8GB is nothing and I always in a yellow/red RAM pressure zone. My 8 core M1 CPU barely struggles while always being used only for 5-25% of load, so clearly my bottleneck is RAM and MacOS. Funnily enough, first 2 releases of BigSur were totally fine with me and then things went downhill.
Artisright mentioned one things that awaits us: Studio introduced 20 core CPUs with 128GB of RAM - there is so much less incentives to hone your code and make less power hungry software. Apple with its' buggy MacOS is not helping either - I restart once a week now, used to do once a year.
PS. My habits haven't changed at all since i am conservative and only visiting the websites that i always used. My work habits also the same since using above 2 laptops I was doing the same job on my laptops for the last 3 years.