while I never played supcom competitively, spring rts is the same thing - and that I did play competatively for a bit.
If there was ever a moment during the course of the game you were not using as much flow as you had, you were either losing, or playing against an incompetent opponent.
The same holds true here, to an extent - non-infinite ship caps means using 100% of your resources 100% of the time isnt always possible, but you generally can make up for it by getting stuff killed more often.
Currently on a diff 8 game, I simply dont have the resources to throw around on merc ships 'just because'. Sure, if I sit around, tab out and forum more, my resources would stack up, but I dont play games to watch stockpiles accumulate. AI war is a game about blowing stuff up, and I intend on doing that as often as possible. 60 planet map has gone on for 7 hours now, and I'm fairly confident I can finish it within the next 3..
I realize being aggressive isnt really the norm (in most multiplayer games I've played, I tend to be the first to advance and take a system) it certainly gets stuff done. With hybrids and other fun stuff reinforcing on the other side of that gate, I dont have time to sit around and build parasites to collect random ships.