I feel like having 15 points to spend on a selection of 40 skills is limiting enough on its own.
This is my feeling as well. The game is sufficiently in-depth that starting another character to play in another style isn't really viable; at least to me. And we're given free storage bases to use so changing fleet compositions regularly is entirely possible - but the current skill system forces you to commit to, at best, one or two styles of play.
I think the idea was that we would respec fairly regularly with the 1 SP cost there to disincentive doing it all the time, but not make it prohibitively expensive to do so, but in practice it just feels like a pain in the rear end. I think this system could work well, more or less, because it does ask you to prioritize things while still gaining levels, and to meaningfully fill out the skill trees you'll be looking at something like level 25 or so, which does take some time to reach. It also gives you goals to achieve after you've maxed out your "first choices."
And after you've filled the entire skill tree out, well, there's still max level bounties and other insanely difficult [REDACTED] to tangle with and XP still gives you story points so you still get something out of taking and winning fights past battle salvage.