No, what I mean is, o and u get an umlaut (two dots) to become ö and ü, but i doesn't get an umlaut, it's just a single dot from ı to i. Why not make it i and ï? That would be more consistent, in my opinion.

See https://news.ycombinator.com/item?id=45564152.

I guess the aim was to reuse as much of the standard Latin alphabet as possible.

A better solution would have been to leave i/I as they are (similar to j/J), and introduce a new lowercase/uppercase letter pair for "ı", such as Iota (ɩ/Ɩ).