yes, they are not nearly on Googles level, not even comparably.
Secondly it's not even primarily about that, even if it made no difference, two competing shitty companies is better than a full on monopoly.
I'm not coming from google hate, I just want there to be more than one actor, therefore I will never ever pick the largest one.
If they control the browser core they control the web, no two ways about it.