I've been wondering whether this design, three vertical stems with rounded apices, would be good for the Cyrillic capital and small letters Em (М м). Latin Mm followed by Cyrillic in all samples.
The above examples don't look too refined, but otherwise, apart from adding another set of verticals to a script overwhelmed by them, is there a legibility issue? Can this shape be mistaken for Cyrillic Te (Т т)?
I guess this is an example of such failure:
Note how Zoo 300 tries to mitigate the possible confusion by nudging the apices outwards.
Some, if not most, of these typefaces avoid the issue altogether, for the price of style.
About these I'm not certain.
For Blackletter, this seems to be the only option either way.