The waste of time would be for a professor to train you up to be a researcher before you’ve proven you are ready, hence the homework assignments.
I think the way to know if you want to be a researcher is more along the lines of: do you like finding the answers to questions no k e has thought to ask let alone answered? If so then it doesn’t really matter the training you’ve or the amount t of the field you’ve experienced, you can focus on that bit as your guiding force.