Bitcoiners are all just constantly slowly marching towards the discovery that every design decision made by Monero is superior from first principals. They must maintain their cognitive dissonance throughout this process by throwing in things like "the forbidden shitcoin Monero" or "It sacrifices the hard supply cap and the simplicity of auditing the supply for privacy/fungibility". Yes, privacy makes auditing a bit more difficult. Yes, the tail emission is a trade off (I would argue not really related to privacy or fungibility)(I would also argue a worthwhile tradeoff as a means of a more sustainable design). Bitcoin constantly discovers the things that Monero deviated on were actually intelligent and preferable decisions over time. Damned near every other block chain just treats privacy as a bolt on feature, but it's not. Bolt-on privacy is almost always porous and finicky.

I think any Bitcoiner that hasn't converted to subordinating their Bitcoin support to Monero is likely just suffering from a bag bias or sunk cost fallacy (especially since many of them probably ardently went to bat for Bitcoin in the past).