That's what I did - I bought a refurb 16/256 model with 10GbE a week or two after the Mac studio was announced. (16 gig was dumb since I knew I was going to add more, but they had no 8 gig models with 10GbE which I wanted for futureproofing. A day or so after I ordered, they did have an 8/512/10GbE configuration... oops)I am considering the last 2020 Imac 27 with 32GB memory as transition. It has the 5k display and costs less than the Apple Studio Display..
iMac 27" 5K 6-Core 3.1GHz i5 with 32GB Memory , 256GB SSD
What do you think, staying too much behind ?
I think it's been great. A bit dated-looking with the giant bezels. If you've been happily using your 2011 (no GPU problems?), you'll find it a nice improvement. The 6-core i5 is most than excellent for most things. Will you get 10 years out of it? Probably not - I think macOS 16 or so will drop the last Intel machines, then you're probably looking at 2-3 years before a lot of software isn't available on Intel anymore, maybe less.