Microsoft didn't become the successful company we know them to be today by making stupid decisions, the only reason why you think this is stupid is because you are a bitcoiner and this is BTC forum.
In some other forum that's not crypto related, they may not think the way you are doing right now. What you are saying right now is as similar as saying that any individual who has funds to invest, but has not invested in BTC is stupid, but that is not true, there are a lot of successful men who don't want to go anywhere near BTC, let's leave them alone.
Seriously I found this kind of posts even more against the core concept of bitcoin itself because to be honest bitcoin founder himself tag bitcoin as an alternative and as an alternative you can simply just use this or go to other assets which isn’t a thing here, it is part of the freedom that comes with bitcoin. These are big companies or institutions that have been building over the years so a decision like this might look not quite good to us because we know the worth of the asset but to them it’s not all that but that doesn’t makes them stupid.
Microstrategy the biggest institutions in bitcoin holding today at an earlier stage of bitcoin had its founder Michael Saylor fudding bitcoin and saying it wouldn’t work out but today bitcoin is the best thing to him and he feels everyone should be investing into it, that’s how bitcoin has win lots of us to it and we can’t call the earlier decision stupid. Same thing with gold, it is the biggest asset to have and everyone knows this but does everyone has it? No because everyone have their own opinion