Is it because privacy is not a necessary requirement? Or are existing privacy coins not good enough?
Or is it because of regulation? Or is it that privacy coins make the public feel that they are always connected to criminal activities?
The state of privacy coin within the cryptocurrency market is a niche. That should explain why it is not popular, compared to another type of coin, that you also mentioned ETH, LTC and many others.
Most people in general also did not mainly and necessarily pick privacy-by-default cryptocurrency as their choice. Monero by far is the most private coin, currently, so in terms of features, XMR is good enough. The regulation does indeed also affect people's choices, but not significantly.
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Of course, this semi-privacy coin is also more friendly to supervision.
Will anyone be willing to use this kind of coin ?
I doubt it will even gain any traction. Your inconvenience is insignificant that it does not worth to tackle about.