Covering one's hair is not unique to Islam. Nuns do it and so do some more
traditional Jewish women so this conception of modesty crosses religious lines even if nowadays its associated mostly with Islam.
I understand it to an extent but I also see what you're saying and I've said as much before. To me the veil, especially in the West, is more about virtue signaling and identity then about the hair itself and its immodesty. Its more about showing how religion is important to that person's daily life in a similar way that something like wearing a cross might. Neither practice, as far as I know, is something that's actually mandated by the religion in clear terms. But within the current social milieu they serve that function.
And I don't see it as too much of a bad thing. Expressing oneself through one's choice in clothing or jewelry is hardly uncommon so it should surprise no one that some among us with to express their religious identity through certain choices in clothing. And there can be a lot of variation. There's a big difference between this
and this