No I think the experiences match here pretty much. We did indeed hope that she could "answer" call on the watch and have the HA pick up the sound with the watch doing the Mic. Sigh, no luck yet.
The speed difference between the iPhone 7 and 8 is not that great. My wife had an iPhone 6 Plus and it was fast in use.
Most aspects remained the same. Given the costs I can't say you should change such a new device over yet.
The phone clip is a little device that bridges the bluetooth output of lots of things (made for mobile phones) and connects it to the HA using the low power mode that the HA expect to use. It is in the resound accessories section online.
The suggested method to do this (from APPLE and Resound) was to connect both phone and watch (this was really hard) and then when she answered from the watch the Phone would grab the call and make the connection! This barely worked and the call setup time was 10 seconds, lots of people hang up before it fully connects. This is also why any plan that forces the HA user to switch between the watch and phone will not be good. It adds delay in answering. The same thing happens when I call my wife in the car. The HA sometimes lose connection and get it back because the car radio is competing with voice the connections.
If a lot of people were to speak up, Apple might consider better HA support on the watch or maybe one of the HA vendors will make the HA look like a normal headset. Hang in there, 8 years ago NONE of this work very well at all. Maybe in a year it will be better.