I am with a limited understanding of these concerns, and have purchased known Brand Tonearms in the past that have been based on Brand, Aesthetic and Reputation.
My most recent Tonearm, is a Tonearm Model undergone a redesign, I have learned of many of the above considerations through discussion with the engineer who has produced the design and progressively improved on the micro mechanics of the interfaces.
I have been introduced through discussion and demonstration of how Traditional Materials that are industry go to choices, have been considered to be replaced, and then replaced in exchange for a more up to date modern version of a material that has a design intent to be much improved for the maintaining of stability to the materials properties across different environments.
These purpose produced formulas, especially when produced to work in an environment that might have similar conditions as met when used on a Tonearm Interface.
When combined with a 'state of the art', very modern low viscosity lubrication can show 'real time' benefits when incorporated into a Tonearm design.
The demonstrations I have received where the Progressive Work on Mechanical Interfaces has been presented as A/B comparisons between earlier generation and latest generation selection for materials has been quite revelatory.
Especially when a modern material in use that has once made a great impression when utilised, has been exchanged for a same material with a change in machining tolerance for the part to change the mechanics at the interface, and a 'cutting edge' lowest viscosity lubrication has been used.
I am now fortunate to have a friendship with Two Individuals producing Tonearms with the above design intent and considerations.
The other designed Tonearm using the above design considerations is a complete New Design, with all parts needing to be produced to unique forms for the assembly.
It does not utilise any off the shelf parts for the structure, even the micro parts that are bought in, to be used in the concealed locations, are machined to a new tolerance to create a improved interface.
I do not use any of my earliest purchased Tonearms any more, I have now got access to Tonearms that I am confident are an improvement and are noticeably better.
It is a pleasure to know individuals who are not asleep at the wheel, and remain enthusiastic about materials and designs for a Tonearm, occasionally trying out that new idea that has been niggling them to investigate.
I thoroughly enjoy my invites to offer an assessment of the advancement of the designs as they evolve.
Again for the OP, what really matters is what is in place 'under the hood', $$$$$'s of outlay for a very attractive modern design aesthetic, might just be that only, a Ornament that has a added bonus of offering a Tangible Interaction.
The reality is that a much lesser value $$$$ selection of Tonearms can prove to be a match in the mechanics and operation and presentation.
How Old is your Tonearm? There might be an upgrade to your model available from the Manufacture.