Pansexual, polysexual, and omnisexual are all microlabels and are all subsets of bisexual. You don’t need more labels than gay, straight, and bi.

Not understanding what words mean isn’t an unpopular opinion, you’re just wrong

Not about the first bit, that’s arguable

You definitely DO need more labels than straight, gay, and bi. For example: asexual or sapiosexual, those don’t fit into any of the 3 you listed

Sapiosexual means you have a preference for smart people. Its not a sexuality.