Because you once again have not proved how Gellius is better than Nadia at anything except tanking golems.

Solano doing true damage to a group does not make Gellius better than Nadia.
Olivie being a better duelist than Nadia does not make Gellius better than Nadia.
AW Berna etc. etc.

You keep sidetracking and not addressing the main issue of how the "anti-situational yet inefficient" Gellius is somehow better than the "situational yet effective" Nadia.