I got it on Friday, loving it so far. Upgraded from the OG after seeing that I will get around 250€ for my old one on eBay. When the 2019 version came out I skipped, despite playing 50/50 in handheld/TV. So the longer battery is welcome, but the main reason I got it is for the screen, obviously. And it totally delivers! The size is now perfect, how I always wanted it to be and I noticed that it changed the way it feels to play games: it now feels more like I would actually play on the TV (albeit with lower res of course). And the OLED is just wow. Btw, I dont have any issues opening the game card slot and my nails are normal/not long. I think that was over-exaggerated.
So I'd say if you are playing in handheld a lot and you like a bigger and better screen sell your old one and you won't regret it. For people on the fence go check the screen out in a store.