I would (I do).
BMW tried to make the i3 "simple" and didn't even bother providing a means to limit charging.
Meanwhile, just about every EV before and after the i3's introduction suggests the 80% cut-off for daily use.
Owners often cite the i3's buffer, But other EVs have battery buffers as well, and frankly the i3's buffer doesn't add up to 20%. On top of that, a significant portion of the buffer (difference between usable and total capacity) is reserved for the bottom end -- the car can't discharge down to true 0%, either (as can't other EVs). That puts the top end buffer at around 95% of the pack's total capacity, depending on year and pack size.
And this is using 2013 battery technology! Consider the ID.4 which I also own has a very new, very precise battery management system still comes with an 80% suggestion from VW.
Likewise, even BMW with their new i4 and iX is providing an 80% suggestion, plus charge limiting, and even current limiting.
There are plenty of arguments that regularly charging the i3 (or any other EV) to 100% has not shown any substantial degradation, and for that, I don't have a good answer. Other data does. We've seen that the early i3s suffered accelerated battery degradation but that could be for any number of reasons -- battery technology, pack size, charging habits, who knows. Likewise, there is a lot of mixed data out there for other brands of EVs as well.
So to that I say this: if all manufacturers (of cars and batteries) recommend 80%, and it doesn't interfere with your day to day use of the car, why not? What secret sauce did BMW have for the i3 in 2013 that nobody else seems willing to reconstitute, including BMW? If, on the other hand, it's impractical or you don't care or you know you won't own the car in 5 or 8 years or you actually need 100% range for day to day use, then do it, BMW says it's OK.
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