and I see the excuse that protesting is still useful because it gives you a means to organize for further action

That’s not “an excuse”. Look at basically all revolutions which weren’t just military coups and you can find meaningful protests. They’re a major entry point to those “better ways” you mention.

A protest isn’t inherently effective, going there and simply standing around listening to speeches is a waste of your time, but it is still an important tool in social change.