A.
Drastically reduced anonimity. With a simple filter of transactions anyone with half a brain could identify transactions coming from YoMix.
While their mixer is new, bitcoin transactions are forever. In short notice, mainstream services will see all their transactions and potentially even block you retroactively if you had ever touched coins related to YoMix.
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But it all boils down to YoMix basically reuisng the same addresses over and over. This is a very bad practice for a mixer.
This leads to situations where it's very easy for even a basic block explorer to group their addresses. For instance, here's a main family of addresses YoMix uses on walletexplorer:
https://www.walletexplorer.com/wallet/2584d8142e542ff5The same could have been said about ChipMixer, even more since their chips were all known on-chain, but yet they became the number 1 mixer. Also, knowing you used a mixer =/= making mixing useless. Even if you say I used a mixer, what do I care if you can't connect the output with the input (pre-mix)?
B. Reduced functionality. Setting fees wrong can result to your transaction getting stock for an indefinite amount of time. This uncertainty of course makes any transaction passing through YoMix pointless as it's uncertain if it will ever arrive to its intended final destination. This should have been the most basic functionality to program when creating a bitcoin mixer, but it just shows that yomix developers were really inexperienced in programming bitcoin.
Easily solvable with CPFP anyways.
Moreover, YoMix is a bad mixer overall. Out of respect for what migh have been victims, I'll be deribelately vague with this just so whoever had sensitive transactions "mixed" by YoMix can have time to re-organize and disengage his finances from this ordeal (I'd personally recomend using just monero this time).
Vagueness = nonsense as far as I know, so this point can just be completely disregarded.
Another thing that's very suspicious about YoMix's funding is the high proximity it has with Kraken.com. It's obvious that from every "mixing" transactions many of the feeding addresses are directly funded from Kraken. This normally would be a very bad practice and is something no real mixer does. This is actually evidence that YoMix might actually be a FED honey pot.
Scrambling coins, getting new "brand new" coins through exchanges = directly connected to the exchange = FED connected? Also nonsense.
Note: I have never used YoMix and have never joined their signature campaign, talked with them, etc... your points just aren't that strong, IMO.