Prior to having a Steam Deck, my overall video game time was fairly low since it took time to boot the PC and start everything up. With the SD, it's much easier to grab it and get a small session in, and I've purchased a number of games (and will even buy games on Steam at a higher price than elsewhere) because of the Deck. It's the price of convenience, but well worth it in my opinion.
At least they don't go out of their way to block heroic games launcher/Linux and I'm happy with that.
Back when the whole Steam on Linux started, they saw Windows 8/10 as a real threat to their existence. (Windows S?)
It's just that the way they went about to solve this in an open way is what's nice.
They improved the graphics drivers situation, invested in Wine and other open source projects, put in a lot of effort to create a user experience they wanted on a handheld device.
Ultimately this gave them a real edge over their competitors. Was surprised to see random youtubers making videos on how to install steam OS on their more powerful Rog Ally/Gpd/Home theater PC etc ..
Google used to be like this once upon a time, long long ago... (That blocks phone, unlocked bootloader on all their Nexus devices, Linux improvements for Chrome/Android etc...). Not sure if things really changed or it's just in my head, but they no longer seem that way.
But yes, there has always been a big dose of NIH from corporate. Sometimes it is warranted, but many times it's extra work on this hope that they hoard valuable tech to themselves.