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It seems to offer less than the average Android or iOS? Why should I use it?

If you have to ask, you probably shouldn't. It's for people who buy a phone for its low price, who don't care what the OS is.

If I buy a phone for ~60 bucks there is already Android on it. If I don't care why would I even install another one?

End users aren't supposed to install KaiOS, vendors are supposed to ship handsets (like the new Nokia 1) with it preinstalled.