He is just not an as good dribbler and has 2 or 3 km/h less top speed - something he always had in his career - if that was a criteria he would not have made his career...
He was topscorer in the first half of the calendar year - and has more assists and goals than Coman and Musiala in the calendar year with 700 or 800 minutes less - having had health problems in the first some months and lacking match rhythm.
He has as created as many big chances from open play in the Bundesliga as Sane who is the best - Müller with 430 minutes, Sane with 1240...
There is not worse than them... - you can only discuss about playing style or what you or Tuchel prefers... - the story is that Müller should have far more match time.
You can't judge Coman and especially Musiala only by their scorers. How many dangerous situations does Musiala create out of nothing by turning around his opponents and immediately dribbling towards goal? How often do Comans and Musialas dribblings open up space for their team mates because 2 or 3 opponents need to focus on them?
Müller is still a valuable player but it's not like he set the world on fire in his limited game time this season. Yesterday was arguably his best game and the most impact he had since his assist for Tel against Kopenhagen. And even in this game Kane and Sané were definitely better than Müller and Musiala also in my opinion.
You said the others are simply better dribblers but thats a quality we rely on in 90% of our games.
In games like yesterday with an opponent that plays attacking football we have much space and this is where Müller can still shine with his intelligent runs and passes.
In most games however where the opponent just parks the bus in front of goal and Müller doesn't really have anywhere to run to he can't contribute as much to the team as the others. You need players (especially wingers) capable of winning their 1:1 or 1:2 duels in these games.
Let's take a look at some websites rating teams and players:
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https://www.whoscored.com/Teams/37/Show/Germany-Bayern-Munich (Müller on rank 13, the 4 attacking players I mentioned are the best rated players in our team)
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https://www.fotmob.com/leagues/54/stats/season/20946/players/rating/team/9823/bayern-munchen-players (Müller 12th, Sané Kane, Musiala, Coman in the top 6)
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https://www.kicker.de/bundesliga/fc-bayern-muenchen/topspieler (Müller not in the rating because he didnt play enough but again Sané, Kane and Musiala on top)