I have a Oneplus 5T (dumpling) and get much less frequent updates (which puzzles me : I though they would have an automated build system i.e. that all supported devices would have exactly the same updates at the same time...)
I have been running lineage for more than a year in my OP5, I don't face any issues with it. I don't use microg. I have also rooted it with magisk, so that banking apps will work.