Disney+ isn't available on all standalone media streamers either. My experience w/ Roku isn't great either. Very disappointed w/ the Roku Ultra I have.
Good luck getting a non Smart TV these days on anything besides extreme budget TVs.
I've actually grown really used to it and if you ever use the browser mode on your OLED it's a huge perk. Like having a mouse for the tv. Trying to use the browser on my samsung tv is painful.
Mine is my desktop display... Doubt i'll ever need to use the browser
. Plus you'd be stuck using the onscreen keyboard as AFAICT it isn't possible to use your phone as the keyboard.
The Samsung smart TV I've had since late July gets frequent updates. Way more than my Nvidia Shield did (and they didn't make the TV a POS, like the updates for the Shield did
). The new LG I bought had to do 3 updates the day I bought it. Although the Vizio my sister had that was barely 2 years old never got Disney+ near launch. So I guess its a crap shoot.
As for speed I guess that depends on the TV. I can swap between D+, Netflix, Prime, or my PC w/ zero latency. All three streaming apps are kept loaded in the background. For for my lower end Samsung, not so much....