plus has memory compression.

FYI, Android has had zRAM support since KitKat, which is from (checking notes) 2013. Same year as iOS.

iOS uses way less ram than android

Common measurements I have seen is around 40%, I wouldn't say way less, but it is definitely less. Still, 3x more for a model in the same year is impressive (and more than needed to be competitive with iOS) and we should give OnePlus credit for it.

Sadly a lot of low-ish to midrange phones are going back or sticking to 6-8GB today, thanks to the RAM squeeze and the efficiency of iOS is certainly helping Apple here. Certainly nobody is going to complain about the performance of the iPhone 17, despite only having 8GB RAM.

In Android, Samsung doesn't seem to suffer as much. You can pick up an S26 here with 12GB RAM and 256GB storage for 623 Euro, which is a nice midrange price. I guess there are benefits if you can produce your own memory.