Personally, I disagree with your premise and I do think the killer app for Bitcoin is to be transactional--unlike Ethereum you can't build anything on top of it, it's just "money" or "wealth" which do need to be spent, although you can think of the current incantation of Bitcoin as "wire transfers" (a few hours to a couple of days to get your money) instead of a "debit card" (instantaneous transactions).

However, I do not at all understand why you are apparently being downvoted for a calm and logical counter argument supported with good use cases.