@Mysteronz
I have not noticed any issues with Regen pre or post comfort 2 upgrade.
Also please do not get confused about this Regen does not work when you battery is 100% full issue and in ACC mode issue.
In both case the car will slow down as soon as you foot comes of the accelerator.
The issue then is when does the brake lights come on to indicate you are slowing down.
This is when things become complex and a lot depends on how the vehicle is set up in regards to dual regenerative and hydraulic braking etc. There is now an international worldwide standard by which regen braking should be setup so it is uniform in all cars. The American have their own standard but it is in principle same as the international one. I can not say for sure for ZS EV but it is thought that this issue so far as the ACC in ZS EV is that the car slows down when ACC is triggered by hydraulic braking, the brake lights come on but regen does not kick in . I have not tested this myself but apparently it is amendable to an update and MG may update their software by end of this year to sort this out. Again this is just a rumour. I am not 100% sure.
The 100% charge no regen situation is slightly different. It is a hypothetical question that you do not need to worry about in real life.So I will address it in real life terms. It is a bit misleading. Yes your battery will not go from 100% to 101% then 102% because of regen once the battery is full. The effectiveness and efficiency of regen is measured against range/ battery capacity and not the against the ability to reduce the speed of your car.
So when people say regen does not work when your battery is 100% what they are saying is it will not increase battery capacity any further once it is 100%. Then comes the question will it slow down the car and when will the brake lights show? Well again it is complex again depending on the dual regenerative and hydraulic braking setup. However for this particular situation so far as slowing you car down is concerned this is what happens in real life .....
As soon as you lift your foot of the accelerator the car starts to slow down and regen will control the pace at which this slowing down occurs. The pace of regen slowing the car in turn depends on the speed at which you were driving in the non regen state, the slope of the road and the regen level you have set
So depending on the make and model of car and the factors I have mentioned above regen will not work at very low speeds eg less than 5mph but will otherwise work irrespective of the 100% charge on your charge monitor.
So yes use your brakes wisely whenever you are unsure that the brake lights have been activated but never solely because you think the car will not slow down or the brake lights will not come on because your battery monitor is showing 100%.
Remember the car is programmed to have a functional charge buffer of about 2.5 kWh so when your charging monitor says 100% the battery can still pick up charge and even in the absolute theoretical condition where this buffer is completely saturated for example after a very prolonged slow equalisation charge then the BMS in the car will protect the battery from receiving any further charge from regen but the car will slow down at a pace corresponding to the level of regen you have set all the same without adding any charge to your battery. The issue is will the brake lights come? The jury is out on this so far as the ZS EV is concerned. Some say yes others say no but I have not seen any one who has truly experienced this 100% full charge issue in real life.