As you may know, the Lossless Scaling program has made quite a splash and has significantly improved with the latest updates. According to current tests, frame generation works very well and helps achieve smooth gameplay in many demanding titles like Starfield and Stalker 2, which were practically unplayable before frame generation.
My suggestion is to add native frame generation support directly into the Steam menu (similar to the built-in FSR).
At the moment, this program has to be installed as a plugin, but such technology would fit perfectly as a native feature of the Steam Deck.