I left that life 15 years ago we had Microsoft guys and linux/ redhat back in the day. and for me never crossed my path also Unix, So trying to do things now is a big learning curve. The world panicked back at the end of 1999 when we went into the new millenium they thought all the computers would crash which they didn't....
either as you say go for a commercial build or an opensource it is up to the individual and yes there is the forums to help you out, but are we not here to help each other work it out? Yes there are stumbling blocks but they can be overcome. At the end of the day I don't mind there is always tomorrow and another rebuild of my machine So does not bother me, Also I am gaining (well hopefully) experience on what works and what doesn't at the end of the day it is a hobby and opensource is free... I am all for linux but as to what flavour is down to the individual some work and some do not depending on their equipment and needs. for me I am a tinkerer so can afford to trash machines and start over again. Not only for astronomy but for other applications as well