Yup the plastic pull start with the matal pawl...I agree with what you're saying about fcc's. They take up needed crank volume and are more then often unbalanced. They aren't really beneficial. Smoother crank bearings are a better choice.
I once went real strict with my squish and ended up ruining about 4 aluminum pull starts. From that I found out the plastic pull starts were better because they would flex more and not just crack like the aluminum ones did. I also started going a little looser on my squish because it was such a pain to start.
I don't buld them like that anymore either I would rather get a summer worth the fun out of an engine and go 5 mph slower then have the engine torn down every weekend.
don't get me wrong I do have an engine like that ready to go on the shelf just in case somebody is trying to race me 🤣
I actually have five engines right now all built different ways some for low end torque some for speed runs all different things for different conditions and I mean why not when I can buy them for around 65$