Having just started using the Amiga again last week for the first time in 20+ Years.....!
I can't say I miss anything. Predseda put it correctly.
At the end of the day I only had a standard 500 back in the day, now I have a 1200 and WinUAE.
Yes it would be great to have modern browsers, flash and all the other things we are forced to rely on but I think most of us accept it for what it is.