That offside still irks me, but I’d never want to see the club going down the legal route to try and get an outcome out of this (more competition money or final place etc.,)
We’ve seen numerous times with decisions worse than that one that nothing gets done, and eventually just puts the club in a bad light (look at the criticism Forest are getting right now for exploring a public challenge to VAR decisions, and Liverpool got for asking for a replay). I’ve seen almost complete unity across all (non Man U) fans all over the world that we were robbed or deserved the final, no need to sour it by looking like chancers/victims feeling hard done by, or vindictively going after the referees/officials.