Could be. Beams need slower maneuvering to aim. When it's just blobs you can fire and forget, but to maximize your beam shots you need a steady course. Whether that makes sense just in-universe or also in-engine (both) is up to interpretation.
Anyway it's interesting combat theory!
I had the idea that modified transports/freighters could make good gunboats. Satis, Isis, even Poseidon... give them some better blobs, flak, AAA beams, and they can fly so fast even if a large beam lands a hit it slides off such a tiny target and so gets only a fraction of it's damage in. I mean there are obviously problems. But... a couple dozen Satis hurtling around your Orion pumping heavy flak/heavy terran turrets into it? Also has value as a cheap solution for local militias and struggling rear-line units.