It seems you like the idea of your own truth, and deny the obvious that nobody else bats an eye about your issues you experience.
Eh ... something, something, pot, kettle, black? Was I the one who started attacking my opponents and belittling them when they argued against me? Who here has shown the most willful disregard for other people's opinions? If I were you, I'd start with taking a look in the mirror. I've described some inherent issues with phone gaming. Whether these are major issues or not is a matter of opinion, but that they exist is undeniable. The SD is certainly a major step up from phones in ergonomics, given that it has something besides on-screen controls, and a noticeably bigger screen.
Pretty much the game has to be tailored for the deck and phone and they fall in to the same bracket. You won't be playing keyboard tailored games on the Deck, simply because of the controls and UI. Press E to continue, eh?
So now you're switching up your argument from "why the hate for phone gaming?" to "UI problems will kill the Steam Deck"? It's hardly ideal, but for games that completely lack gamepad support and need more than the 14+ buttons available for mapping (d-pad, abxy, shoulder buttons/triggers, analog stick presses (+touchpad input)), Valve have had
a passable virtual keyboard for years. Is it ideal? Obviously not. But there aren't
that many games that will need more than 12 buttons either. The analog sticks let you avoid wasting buttons for WASD, so then you can have for example Tab, Shift, Ctrl, Q, E, R, F, G, 1, 2, 3, 4 and left/right click mapped. That's sufficient for most games. Clearly not all, but nobody has said that this will be a perfect experience in every single game ever made. That doesn't take away from the fact that this will be able to run the vast majority of games just fine.
It is not only the controls, but UI. Especially on small sized screen like that... You barely could see that press E often with certain games.... let it be mapped as a control on joystick.
My point is, that large amount of x86 titles won't really be that joy to play. I've tried to stream some using the in build remote play and PS4 joystick... it actually would look as close you can get with the deck. Small text, details UI like maps... it is only the controls. The hurdle is the same is in phone games, it needs some work more.
That's where the low resolution of the screen will really shine - rendering at a lower resolution typically means UI elements are bigger overall (especially on poorly maintained older titles, where this problem is the biggest), and will be more legible. If you're streaming your games, they are likely rendering at 1080p or above (or are using DRS with a 1080p UI resolution if it's console streaming) - and a 1080p UI scaled down to a 7" 800p screen will probably be near illegible, yes, especially one that expects to be rendered at native resolution and at PC-like monitor sizes and pixel densities (those same games are typically unplayable if you try to play them on a modern high DPI display as well). But rendered at a native 800p? It's likely going to be fine. Perfect? Obviously not. But again, perfect isn't the goal here. The point is to be able to play on the go, on the couch, on the bus, whereever, in a way that a phone simply won't let you do. And a display large enough for a perfect UI in those games isn't going to be doable in a handheld.
As for your streaming experience - was that on a phone? Remember, a 7" 16:10 display is significantly larger than the common 6.x" ~19:9 phone displays, by a pretty significant margin. Take the Galaxy S21 Ultra - a very large phone with a 6.8" display - the Steam Deck with a 7" 16:10 screen has 26,5% more screen area. Compared to something more sensibly sized like the iPhone 13, the advantage is 54,8%. Couple that with the much, much higher pixel density of the phones, and you have a recipe for a very poor UX on the phones, and a much better one on the SD. And, of course, you won't be obscuring the sreen with on-screen controls. Does that mean the SD will be problem free? Obviously not. But it has a much greater chance at being workable.