SteamDeck + SteamOS has the same compatibility and playable games as ArchLinux/Fedora/Ubuntu/desktop linux.
PS5 and FreeBSD do not have any overlap there. If PS5 had no proprietary layers on top of BSD (or the layers were otherwise accessible to the public and could be installed on top of BSD by end users), then you would be right in a way.
But any game released for SteamDeck, I can run on a linux desktop without any special tweaking, so they are related enough. Any game released on PS5 will not run on a BSD desktop, so clearly they are not related in the same way.
SteamDeck being popular and mainstream means that more games work on SteamDeck, and more games working on SteamDeck means more games working on Linux. (Another aspect which is not true of PS5 and BSD).
So having people in the industry, who will potentially be involved with the studios, having (and enjoying) a SteamDeck means studios will hear things like “I hope I can play this on my SteamDeck” from people involved in the creation of games … which helps push forward Linux gaming. Even if only a little.
SteamDeck + SteamOS has the same compatibility and playable games as ArchLinux/Fedora/Ubuntu/desktop linux.
PS5 and FreeBSD do not have any overlap there. If PS5 had no proprietary layers on top of BSD (or the layers were otherwise accessible to the public and could be installed on top of BSD by end users), then you would be right in a way.
But any game released for SteamDeck, I can run on a linux desktop without any special tweaking, so they are related enough. Any game released on PS5 will not run on a BSD desktop, so clearly they are not related in the same way.
SteamDeck being popular and mainstream means that more games work on SteamDeck, and more games working on SteamDeck means more games working on Linux. (Another aspect which is not true of PS5 and BSD).
So having people in the industry, who will potentially be involved with the studios, having (and enjoying) a SteamDeck means studios will hear things like “I hope I can play this on my SteamDeck” from people involved in the creation of games … which helps push forward Linux gaming. Even if only a little.