I’m saying they won’t do it because it requires work and they don’t think the market is big enough. As you noted, the process for getting EGS on Linux (Deck or otherwise) isn’t straightforward, so few people would do it, which makes the market even smaller.
And it’s not just enabling an option once, they would also need to do some level of QA testing to make sure it’s playable and not easily exploitable by cheaters on Linux. That all costs time and money.
So I completely understand why they wouldn’t bother, the profit just isn’t there. I still think they should, I just understand why they don’t.