For privacy purposes we always recommend to use TOR, clearnet can't be considered as safe w/ or w/o using ddos-guard/etc.
If it's very recommended, better to put that link on our signature also like other companies. ( I just saw that onion link on full member signature only).
I ever use TOR, and maybe if the user wants to use that onion link, better to have high bandwidth internet because when I tried in past, it was so slow if only have a 1-3 Mbps hotspot from the phone.
Just asking question out of the blues, why we need privacy based browsers when we use mixing services or it is just an optional way to add more privacy to our transactions?
I am just trying to understand the principle behind the same because if I know one thing, if I am using lets say YoMix for minting entirely new coins from my old one's then I am trying to rely on the service for my privacy only. The question is why would I need TOR like browser to use such service if they are already providing what I am seeking.
It could be dumb question for which I would be happy to get answered, considering my curiosity for the same.

If it's very recommended, better to put that link on our signature also like other companies. ( I just saw that onion link on full member signature only).
If using TOR really makes any difference then definitely we should have it either published on the YoMix site as well as have the corner of Signature code updated displaying TOR or relevant browser name for additional security or whatever purpose it may solve.