Yes, they aren't keen on the format, but seem to like the hardware, beyond it showing essentially 4:3 (or 3:4 presumably) games on a 16:9 screen. But their main beef seems to be the fact you have to swap cartridges when you want to change the type of game you want to play. That has made me revisit that fact personally as well, although part of it for me was always having a retail release of games I've long had the roms for, but without physical media to back them up. The same reason I used to buy arcade collections on CDs and DVDs back in the day.
I'll be honest, when i go back back to loading C64 titles, even though they are still miles quicker than back in the day, i sometimes get a bit "meh"...
However, the downside I've come to see with roms, is the general short playtime of just about every game, with it being so easy to just change. When you loaded a c64 cassette, there was no way after 20 minutes waiting for it to load were you going to switch it off after a single go
Even before the backups/roms we had the switch to first discs from tapes, then on to CDs and that sort of thing. But by the end of that, I was already cussing the splash screens that popped up for game engines and music codecs that added to the load time in a way that didn't add one jot to my enjoyment. I even stopped playing GTA: Vice City on PS2 due to the terrible load times. The quicker the actual data load times, the more frustrated we allow ourselves to become with anything else.