This is a great observation! I regularly end up with M33 devices I program as they make sense for reasons other than security. (E.g. an Atmosic one, and St ones like L5/U5/H5). I look at the secure flash functionality and think "This is annoying and I have no current or projected use for this."

I ponder "What applications would I want this security stuff for?" Crypto wallets are a great example... and the crypto wallets in the wild aren't using them, as you point out!