Have you not been paying attention to what Bottas's job is? Bottas is good enough, without being too good. He's particularly effective at holding faster cars up, which makes him the ideal rear-gunner.
Merc had 4 harrowing years of Nico vs Lewis, and are now experiencing the relative bliss of still winning the WDC and WCC every year without any sort of serious internal strife.
Ocon coming in as a young charger just as Hamilton starts to get too old for this shit is a much preferable scenario than having the two butt-heads.
