I mean they work in a sense that retroarch loads them up and recognises them but there is the tradeoff that lr-desume & lr-desume2015 do appear to have slower frame rates, brief freezes at loading points and audio drop outs.
Whereas drastic is miles more stable and a higher compatibility, but won't have the libretro bells and whistles like achievements or overlays.
Honestly if achievements are a deal breaker for you I'd play on a more powerful setup. Or wait until the lr core of drastic is released, whenever that will be (I think the Dev's own forum said sometime 2020 but, you know, 2020 things)
@simpleethat if you install raspbian(pixel) on pi4 in retropie setup, then configure on desktop then when your done just play in retropie, I play from desktop for now cos my kids use some cheats.
Use keyboard to exit since or add your menu and press twice, but be careful not to enter a menu and get stuck, it happen to me and I reset my settings, hehe.
Yes I have a pi 4. I did manage to make some changes to the settings it was a challenge lol. I can change the internal Drastic views on a horizontal screen. But I want the whole screen rotated 90 degrees(vertical) so when I stack the screen top/bottom it uses up most of the viewing area. Here's what I would like to achieve on Drastic. This is what my lr-desmume looks like.