> It just happens that the use of vector spaces massively helps thinking about linear algebra problems.
That is the point here.
> CT is applied to many domains.
Yes, but in which of those does it massively help? I just looked up ZX calculus, and I am sure you can formulate that better by not mentioning CT at all.
As usual, quick googling reveals that the ZX calculus is really just a CT repackaging of Penrose diagrams, which were discovered and used without any involvement of CT.
That is the point here.
> CT is applied to many domains.
Yes, but in which of those does it massively help? I just looked up ZX calculus, and I am sure you can formulate that better by not mentioning CT at all.