I say go for it and just play whatever you think are objectively best and/or most fun.
I keep reading in these forums that the danger of playing main lines is that you could walk into your opponent's preparation or that they'll be prepared for the theory etc etc. I really want to know who these scary phantom <2000 players are who have memorised and studied opening theory in depth up to move 20 and beyond.
" Preparation " for me now is very different than it was in the USA . Its almost impossible to find the games of many US players in databases unless they play a lot of fide rated chess and not many do. In Europe thats not the case and I can check what even sub 2000 players play , if I so desire, and have a nasty surprise waiting for them in their favorite opening/defense. In general though I dont prepare for specific opponents if they are under 2000 .
I've started to favor 3. Nc3 in the French and 2. Nf3/3. d4 against the sicilian again, but there's so much theory in some lines and I don't want to devote all my chess time to opening theory when there are other aspects that need improving as well. I know the main ideas in these lines (Wineawer gives black structural advantages and white attacking chances, Yugoslav is a opposite side race-to-mate, etc) and about 8-13 moves of theory in them, but no more. In these sharp lines, should I be concenred into "walking into my opponent's preparations" in an OTB tournament at a 1600-2000 level? Or is that not a concern until like 2400+. I like those lines, but not if it means playing someone who knows 27 moves of book lines in sharp variations!