But I'm talking about the minimum amount spent without paying as much as fees. I don't think spending 10$ + paying 10$ in fees on it is a good spending manner.
Of course, no one would want to pay above $10 as fees for a transaction and it limits Bitcoin usage as a medium of exchange especially for much smaller transactions. There are options for reducing the fees paid such as segwit, consolidating, lightening network etc; but these methods have yet to efficiently eliminate high fees especially at times of high network activity. If you're holding, it's better to apply other means of reducing fees.
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Each coin should comply with the BTC-backing requirements so I doesn't simply sink.
Bitcoin does not have any requirements, it is a decentralized technology with no cetrak authority. A system which redeems another currency backed in Bitcoin would go against the core values of Bitcoin.