The TT > Tonearm and mounting method for these two items are all equally important.
A poor functioning TT will not allow the Tonearm to present to it best.
A poor functioning Tonearm will not show the TT when at its optimum performance to be presenting at its best.
A poorly thought-out mounting method will not enable, either TT or Tonearm, if both optimized in their design and setting up, to present at their best.
When this Trilogy of mechanical interfaces is produced to a standard that is sympathetic to the optimised function of each.
It then makes sense to concern oneself about the other ancillaries to be used, i.e, Cartridges and the remainder of the Signal Path.
My experiences have shown myself, that a sub £1000 Cartridge can prove to be as attractive in use as a £4000+ Cartridge when used on an optimised TT > Tonearm Set Up with careful consideration put in place for the Signal Path materials.