This is an aspect of horseshoe theory which is pretty meh tbh. Could you not say that the current status quo is extreme? It would have been considered that way by monarchists back in the day. Extremism is just radical change to the current social order which can end very well or very poorly.

Personally I think labelling ideologies as extreme is a way for those who benefit from the current social order to encourage those who don't to dismiss radical change as dangerous and destructive rather than an opportunity for growth.

Capitalism is an extreme change when compared to feudalism but it is better no?

If you're interested I'd really recommend reading blackshirts and reds by Michael Parenti pdf audio. it's a relatively short read at only 154 pages but it really helped develop my views on this subject