Linking a stable koin to bitcoin is not the best idea, since it is a virtual currency and the meaning of the stable koin, so that it would be tied to the usual assets of institutional investors. For example dollar, pound or gold
I could agree with you.
But my idea is that stable coin is an added value technology, so that an old asset can gain new features.
So Bitcoin, an "old" and single purpose cryptocurrency, could get different features (for example smart contracts, more speed, and more) just adopting a BTC-pegged stable coin