Lr won’t search beyond a single directory. In the future it might. It is the main reason not to move to Lr from LrC.
Yes, Apple is adapting very quickly to new features. Fortunately, software updates have more features without upgrading the phone. Since I’m traveling to Taiwan about once a year, I buy my phone outright. That makes it financially more difficult to upgrade. I moved from a 10 RX to a 14 Pro Max. It will be awhile before moving up again.
Good luck with you IR filter. I’m not moving in that direction. I’m more interested in the video. Taking a course in that now.