This is advice for curious Bitcoiners not necessarily Monero maxis.

If they think Bitcoin will continue to be the best Store of Value it makes sense. I can't really blame them for thinking this if historically this has been the case. None of us know the future for sure. And they have nothing to lose by continuing to save in Bitcoin and only using Monero to spend.

You can either swap to Monero or have a small amount of Monero that you replenish for spending.