Why are majority of isekai/reincarnation MC's such roundabout pushovers?
Do they have to agree to comply to everything? Do they have the literal inability to not give a damn and refuse?
Authors make them out to be characters that have no longing for any fame, but the actions of said characters say otherwise.
Tsundere side characters always have to be convenient plot tools to show how OP the MC is. They either get saved, or challenge MC to a duel. Then MC either loses, which results to even more annoyance from the tsundere, or he outright dominates the tsundere, which also leads to even more annoyance.
Plot tools, clichés, asspulls, and plot armor are already borderline mandatory for these types of works. But at the very least use those with a 10% original concept.
Also,
CULL THE FKING TSUNS