I absolutely love the new macOS look. I am not certain why everyone is dogging on it so much. Tahoe may end up being my favorite macOS in the last decade.

What is so unprofessional about the new macOS?

If you can't see or don't mind the inconsistent sizings, if you don't mind the extreme wasting of space, if the "overlay" sidebars that sometimes overlap nothing like in Finder look acceptable to you, and if barely readable text on transparent bubbles is anything other than unnaceptable, then there's not really anything I can say that will change your mind.