So in the real world - still on the original battery, which had "technical issues" when new .. but seems ok now.
Difficult to say for sure. There's so many factors which potentially influence battery life. I think ultimately, it's an e-bike. Just use the mode that suits your need/mood at the time -feck the rest - enjoy it

. Trying different usage techniques will probably have little overall influence on life span in the scheme of things. Even when you run it "flat" they're designed so they're not actually "flat". The main thing is just not leaving it fully charged if it's going to sit for any reasonable length of time.
In general I just fully charge after every ride, but then it's normally flat or nearly flat.
With lockdown, my rides out are none existent or severely limited. I had been experimenting with riding slower for longer ranges, which works - but is pretty boring - for me anyway.
Other than some plodding on and off trail clearing (when the battery seems to last forever), most lockdown use has been in my new mini bike park, so rides are generally between 6k and 10k but at 100% full intensity going up and down as fast as possible - all in Trail or Turbo. 6k takes about 20 minutes if I stop for a quick drink glug after a few runs and uses about 30% battery. So I'm generally charging to full every 2 rides or it's almost flat anyway.