Regardless of the team size, I say simplify as much as you can so you can dedicate your resources customizing what makes their business special. You mentioned a PBX system and no infrastructure, this makes me think you talking about Customer Management. It sounds like you're documenting as you go, fantastic. Maybe loop in a noob time to time to review the documentation or have a Q&A that reifies the docs. Best of luck!
zbyte64
I think a concern for the business is whether other people can help maintain the system. As such don't go too custom and roll your own. Take things like nextcloud and see if you can fit the requirements by bolting on a few docker services. Keep it simple by using "appliances" where it makes sense (dedicated NAS?).
And how do we know which industries would benefit most from capitalism or socialism? All industries experience diminishing returns of capital investment after a certain point, and that is how Marx made the distinction about which mode of production is "best" for which industry. It isn't inherent that one industry should be socialist and another capitalist, it is relative to how big the industry is and whether there is room for continued expansion.
I know what these words mean individually, but arranged like this two of the three words lose their meaning.