Reminds me of the monty python sketch, "what have the romans ever done for us? except sanitation and roads and canals and public health" lol.

Steam gives devs a huge marketing presence that smaller devs simply wouldn't have otherwise, it gives countless high bandwidth distribution servers that automatically scale to demand, you can integrate the largest PC social community for matchmaking or other multiplayer features, you get a community page where people can post fan content or mods, etc.

That is worth way more than 30% to most devs. The only ones who it's not worth it for are huge companies like Blizzard and Epic who can manage all that themselves, hence why they're pretty much the only ones who don't sell games on Steam.

I have Tails on a USB for temporary use , I don't think it's supposed to be used as a full time OS with persistent storage though.

What a bizarre comment. Of course I need traffic data in a navigation app. Why would I want to sit in an hour queue on a closed motorway due to an incident when I could be using the alternative route that's still moving?

Depends, every tech company I've worked at has had Windows machines for project managers, account managers etc, and Mac for developers and designers. So it is possible to support two OSs as standard. I've always just picked the Mac but when my next laptop is due I may ask if anyone uses Linux