Forgive or Excuse for a silly question. I read for a long time that the monero is conducting a series of forks to introduce complete anonymity and there they specified the date of summer-autumn 2017. so with each fork there could be problems but I glimpsed that it was successfully implemented without any problems. So, this series of forks is already over or is still going on? And is it at all, maybe I'm just confusing something)?
They were every half year. Next should be in few months. I am sure block number is already set. In anonymity aspect it should set minimal mixing. Basically is not really needed, and that was a reason why i had problems to remember why this hard fork is needed, since like only 0.1% of transactions are non RingCT.
The more significant change in this fork will be increasing the minimum ring size. Although the default is 5, still a very high number of transactions use 3 (because people want to reduce cost and choose the minimum, even though this is currently a negligible savings). The fork will increase the minimum to at least 5 and possibly higher. The cost difference of even 10-20 is currently fairly small, and the improved resistance to blockchain analysis is significant.
Mandatory RingCT is largely irrelevant as you point out since nearly all already use RingCT and that would continue to get closer and closer to 100% anyway.