not necessarly, buyng mstr stock INSTEAD of bitcoin (in self custody and privacy) is retarded. Some people could have to maintain some fiat-denominated-credit exposure for various reason, for continue to keep a large business active fro example, or to not result a "total tax avoider".
So fiat credit denominated in bitcoin or microstrategy stocks could be better that fiat credit denominated in fiat money.
Still, I consider totally nonsense having more than a 10% of your stack in fiat. If your business require you to keep fiat and pay taxes, its time to kill your business and stack bitcoin.