That's because Thiago is a specialist and he has been one of the best players in that respect, when he has been fully fit. That doesn't mean neither Fabinho nor Henderson aren't good players in possession. I think there is a clear difference between someone like Fabinho and Phillips from an individual point of view while in possession. I'd make the same point about Casemiro, Rodri, Brozović, Tchouaméni, Rice and Højbjerg. Currently we don't have a Thiago in terms of passing in our midfield, what I am asking for, is at least someone as good as Fabinho in that regard, since there most likely isn't a conductor like Thiago available. If we already had someone like Kimmich, Thiago, Kovačić, Modrić, De Jong or Verratti, I would probably feel differently.
Also, people constantly bring up the point, how Liverpool's midfield initially looked under Klopp, how it was mostly a hard-working unit without any creativity, completely ignoring the fact that they had Alexander-Arnold and Robertson as their full-backs (as
@DWelbz19 also points out above), on top of Mané, Firmino and Salah, which we won't have next season. You can't just take out Bruno and simply expect us to replicate what Liverpool did with their full-backs and front 3, when we simply don't have the same quality in those areas. Moreover, ten Hag is using Tadić, who has been one of Ajax's best players, who is losing possession more often in the Dutch league than Bruno does in a much tougher league. I don't know how your conclusion can be, that we don't create nearly enough with Bruno in the team, so let's take him out, if we create even less, so be it.
Obviously there is the hope that with proper coaching from ten Hag, the team will look better than the sum of its parts. However, the best managers in the league needed better players from an individual point of view, as well. Liverpool became what they are, because all of Alison, van Dijk and Fabinho improved them, especially while in possession.