Because they are maxis that will get eaten by their own pride before they come to implement Monero in 2 years.
With RetoSwap growing quite nicely, they will have lost at least 50% of the market share by then.
Discussion
bisq put monero on the end of the roadmap 💀
then they took the dates off their roadmap because nobody showed up to work 👻
Likely true. Personally switched to RetoSwap a while ago and for BTC there is robosats