Having owned an R56 that guzzled oil and required valve blasting at least every 10k miles, and since I'm now driving an F55 that barely sips oil, I've been curious how much oil residue accumulates on the B46 intake valves.
The answer is not much. Pictures below.
The car: F55, 2019, 38k miles. Driving style ranges from Green Mode to kick down in Sport. Oil consumption appears to be somewhere in the neighborhood of a quart per 12k - 14k miles. It is a bit tricky to get an accurate measurement of remaining oil without a dipstick.

One valve in each of Cyl. #1 & #2 required blasting ( see pic. of Cyl. #1 rear valve). The condition of the front valve in Cyl. #1 is typical of remaining valves across all cylinders.

 

The R series had coked intakes due to the inferior prince engine PCV system.


Your #1 rear looks like bad value stem seal. #1 front, just a beginning of a stem seal leak.