Equipping no warp core stabilizer means you’re not severely limited in combat.
Equipping a warp core scrambler means you can keep people from warping away.
Equipping a warp core stabilizer means you can ignore that single warp core scrambler.
Equipping a second warp core scrambler means you’re wasting a mid slot to specifically also hold people who happen to have a warp core stabilizer.
As I see it, both the people who want to run away and the people who want others to stop running away have each two valid options with up- and downsides.
Each of them can choose to take warp core stabilizers into account or not.
If there was no limit to the amount of warp core stabilizers, we wouldn’t really get more choices, you would just fill the entire low row for warp core stabilizers. And tackle would be forced to fill the entire mid row with warp core scramblers. Would that be more interesting gameplay? Not really, it’s just more of the same choices we can make now, except much more limiting in fitting options.
Previously my haulers were fit with full warp core stabilizers in the lows. I’m glad the warp core stabilizers are now twice as powerful yet limited to 1, so I can fit other modules as well like extra agility, tank and such.