Thanks for your reply. I’m on a phone at the moment but will check it out later.
In the meantime I’ll say that the ambiguous capital I is indeed rampant in sans fonts, but that’s not a reason to perpetuate it. Why have any ambiguity ever, when every schoolchild knows how to make a capital I? There is no benefit in doing so, and there are drawbacks.
The crossbars on the capital "i" are not serifs. Serif fonts have serifs on the crossbar.
Only sometimes does the lower-case L have a tail. And even if it does, there's no way to know that unless it happens to appear in the same text as a capital "i."