I most of my town driving as us 10% power and 70% regen, as this is rather compatible with the traffic I hit in town, so it rather personal and related to driving in Brussels.
On the other hand when I drive somewhat more sporty I like to have only regen when applying the breaks in order to have full controle over my speed. I use only 10% regen on the first step (throttle handle) and 30% and the second level (first step front handle breaking). In this I have some small speed reduction in freewheel behind a car (in the slipsteam) but without the need to finetune the throttle handle to avoid breaking to much and losing contact. Personally I like this as it leaves me more attention to just reacting to the other drivers around. Again this is a very personal approach based mainly because i like to be able to freewheel behind others when driving sporty.
I do think we have all our preferences but it would be important to have the standard setting of ECO (less power but max regen) and SPORT (max power but little regen) being well opposite as we can't change them. The personal preference are in the custom settings.
I love driving these bikes, the power is that direct, it as being in a realtime video game