They all have coaches that have accomplished something and have impressive resumes. They have earned the right to remain in their respective jobs.
Klopp only won the league last season, after 30+ years of hurt for Liverpool fans. He won the CL the season before that. Liverpool are top of their league btw.
Flick won the treble with Bayern last season, and had coaching stints as an assistant for Bayern, Die Manschafft, Red Bull Salzburg, and even coached Hoffenheim for a season. Bayern have a chance to overtake Leverkusen for first in a new days.
More importantly, however, both Liverpool and Bayern have a system of play, a clear and distinct style, ably supported by a competent midfield. We have none of that.
We essentially did what The Brooklyn Nets have done - hired a novice coach with ZERO prior experience.