Meeehhhhh… I don’t know.
Everyone needs to work on their throw. I got centering bearings near when I first started, for much the same reason as you. I wanted a bearing to help solve my problem. Well, and I’m just a constant experimenter.
It didn’t stop me from working on my throw. A crappy throw will still give you wobble with a centering bearing. And the practice will still translate when you’re using a flat. I do think it’s worth having a flat installed into a yoyo at ready access (or heck, you can swap it back in from time to time… no rule against that…) to continually assess and practice. And for the most part I prefer flats (though I’m going through a bit of love for profiled bearings right now for some reason). But anyhow, it’s not like the centering bearing is going to obviate the need to improve your throw.
To NOT get the centering bearing because it helps solve a problem is kind of a circular argument. If everyone waited to buy a problem-solving tool until their problem was solved, they’d be less likely to buy the problem-solving tool, wouldn’t they?
I say get one. Try it. See if you like it. There’s absolutely nothing to lose. Even if you imagine that your throw will be set back a bit, does it matter? Takes you 4 months instead of 3 to get a throw that you’re really happy with (then a whole lifetime of refining and maintaining)? Are you on a tight deadline?