I'm comparing this with the transition from iphone to apple watch (in terms of tech and size). It took countless iterations on both iphone and watch to arrive at the apple watch ultra which effectively can be an iphone replacement. based on the current industry iterations, I'd guess that we'll see a really great product in 3-4 years which is based on this tech just much smaller.
as an ex-mobile dev myself I can say that in my opinion the interface and controls are really interesting already and will allow for a yet not available immersive experience. for example I'm using an wireless VR headset to play halflife alyx and even though that tech is relatively dated, the hand and head tracking is superb; making the experience absolutely amazing. if you've not tried it, I highly recommend it, it's been eye opening for me. any dev that wants to stay relevant has to buy this device and learning how to properly develop for it will likely take 3-4 years as well just to see what people will engage with.
another point that hasn't been mentioned is privacy, you get to watch your personal movies / recordings / meetings / documents without anyone around you seeing it. this is huge for travelers. just like the ability to have a huge screen with you without having to actually carry a screen.
I think most people that use those 3rd party apps will move away to Lemmy, just like I have. I might come across reddit content during random web searches but I likely won't be starting to use the other mobile app on my phone and will certainly not contributed to any sub anymore.