> Every time I've explained this I've gotten instantly downvoted without a single reply making an argument against it,

Ok I'll break it down for you.

> If in 2016 of 2024 even 20% of the dems would've stayed home or voted third party

Parties cater to their bases, and putting yourself out there as an unreliable voting bloc is exactly how you get your demands ignored.

> The whole idea of "third-party voting is a complete waste in the US" is incredibly dumb

It's not incredibly dumb, it's simple mathematical reality. This doesn't change unless the first past the post system changes. Why do you think the GOP backs the Green Party?

> Parties cater to their bases, and putting yourself out there as an unreliable voting bloc is exactly how you get your demands ignored.

I wish more people understood this. Instead, there's this mistaken notion that you give away leverage by supplying votes. It's literally the opposite.

Your coalition will have more influence and leverage within a party by supplying votes, not withholding them.