I still use my iPad Pro 11“ from 2018 and while the performance is still good, I noticed that it’s showing it’s age with web browsing or productivity since it only has 4 GB of RAM since I have the 256 GB model. I use the M1 11” iPad Pro as my main iPad when I am away or in bed, and it’s faster in terms of productivity.
Since the 2018 has 90% of the features, except the extra cameras, LIDAR, Thunderbolt support, and external display, it’s still viable today, although the 4 GB of RAM might be a limitation for productivity.