Additionally, new dialer is not dual-sim friendly at all. Stock MM dialer had an option of per-call selection of SIM used for calling, in-call SIM switching as well as remembering the SIM used for calling individual numbers. The new dialler has nothing of that. Pain in the neck when using the phone in dual-SM mode.
Then, signal bars are also for one SIM only. Consequently, it is not possible to use either SIMs for mobile interent - internet can only be used on one SIM card - one selected in Dual Sim Settings.
Messages app does support dual SIM, but also not in the most intuitive manner (long press the Send icon allows SIM selection). I use Contacts+ for messages. (Unfortunately, Contacts+ has no effect on in-call interface and SIM switching.)