a common fallacy of basic logic.
with FPTP, strategic voting means NOT voting for your favorite. so at the very least, you'd "vote for the person you'd normally support under FPTP, _plus_ everyone you like better".
but in real life, a lot of people will use intermediate scores.
there's no such thing as "acceptable" or not, there are just utilities and _relative_ satisfaction. you want to get the most satisfaction possible from the options you have.
https://www.rangevoting.org/RVstrat6
approval voting is insanely good at this.