If you play the Green marked games you should never have to tinker around and manually install things. Yellow marked games should work but could have problems. The other mark usually lead to tinkering around with settings.

With the Legion Go and Rouge Alley you would technically just run windows like you would on a normal PC and if you want a simpler experience the steam deck is the best thing.

You need to roll back the RPCS3 version.

https://emudeck.github.io/emulators/steamos/rpcs3/?h=older+version#how-to-roll-back-rpcs3-to-an-older-version

The Steamdeck is much more powerful even more powerful then the iPhone 15 Pro Max. Its a cooled system that runs desktop games with overhead due to the translation layer with pretty good performance. It may be not the most efficient system but runs.

EU GER: Ordered: 16th 20:00 CEST Shipped: 22th Delivery will be the 27th since it’s shipped directly from the Netherlands.

Can also confirm just got send out.