Hm, when I select play it opens the launcher but immediately starts E: D without me having to click on anything in it… at least when I start in VR. I don’t remember having to do anything in the launcher in normal mode but it’s been a bit and could be wrong. Could be they started in VR. Could be they missed it or clicked through without thinking, as you said.
Hmm, when I click play it opens the launcher where I can select between Open, Private Group, Solo etc, I select one if them and then the game starts. Switches can be attached to the launch command specially in VR where you don't have easy access to the keyboard, so that you don't have to select options when it launches, makes it easier for VR users I guess, but normally yes there are several option possible to take once you press play.
Even a player clicking into legacy horizons, as per the above screen, will normally have the same options after clicking play, to select Open, Private Group or Solo etc.
And I can confirms, having once been a computer support person, clicking through screens without reading them is normal behaviour for a very large percentage of computer users.