How to assign custom taxonomies to users?

Hello there,

I'm building a community website with MB-AIO, Bricks Builder and WPGridBuilder.
Initially my intention was to create, about 27-30 custom fields for storing various user meta - stored in custom db table.
But, then I read this article Custom Fields vs Custom Taxonomy and it actually seems to be a better idea to use taxonomies instead of some custom fields (e.g. for gender) for front-end filtering users and for scalability reasons.
However, I cant find any straightforward way for assigning custom taxonomies to users.
Also, a LH User Taxonomies plugin suggested somewhere in this forums isn't updated for two years now.

So, is using taxonomies instead of some fields really a better solution for filtering performance and scalability?
How can it be done with MB (attaching custom taxonomies to users)?
Or, should I just put everything into a field group with 30 custom fields and into a custom db table, without overcomplicating things ?

Thank you.