I’m 185cm on an S4 for reference.
The span on this bike is really right at the top end of what i consider comfortable for my height (819mm from memory) - my preference is around 800, especially if you consider the inherent stability of an ebike because of the extra weight.
However my wife has an S3 & that’s just a bit too small annoyingly.
The fact that it’s a HP & the chainstays are a little longer than they state (444 measured on an S4 static - so 454mm at sag) helps balance it out though.
The best bike I have ridden size wise was a large Orbea Wild - in pure geometry terms it was great (for me), just a terrible bike in many other ways. The long travel Sight/Range is a small compromise there for me, but otherwise it’s a really good bike - I described it as a motorised version of my old Dreadnought, which I still think seems appropriate to say now, and that’s a good thing (at least purely from a riding perspective, not the fact I broke it, repeatedly

)