You do realize that without shields, they’d have been blown out of the sky in one shot rather than being able to survive in a firefight, right? It’s like saying what’s the point of a kevlar vest I’m going to get a broken rib from a body shot? If I can live, I’ll take that vest and broken rib, thanks.
Power is relative. There’ve been times we’ve seen weapons from less advanced species than the Federation bounce uselessly off shields or are seen as no threat. We’ve also seen Starfleet ships get carved up like a prize turkey. The Gorn are powerful, that’s just it. That doesn’t mean Starfleet aren’t heavy hitters - at this point it’s just that there’s stronger kid in the playground.