@FediTips We can't be telling people “don't worry too much about all that server stuff for now” and also “oh you don't know if your account was on mstdn.social or mas.to, then you're just outta luck sorry”.
We also know that asking fedi newcomers to pick their own server does not work. Your suggestion addresses this point.
My conclusion is that having a default server for all newbies (not invited by a friend) is the best practical approach. Somewhere people can get their bearings.