So I talked to Andrea. He has one of the best sports/cycling labs in the world. He said for him he doesn’t see any clear proof that tents do much although they seem to be used consistently in pro cycling. Now he believes if you are going to race at altitude spending a month their first is important and if you can live at altitude and race at lower elevations this has a noticeable benefit. He said it seems like no large groups of cyclists are living at sea level and training in high elevations or even the opposite, they really are using tents. I see on another forum that someone said they sleep terrible in a tent and so even if they had any benefits it was not worth it.
It’s interesting. I like to try to understand this stuff.