Never had to add oil. I did have an issue with the serpentene belt slipping, but this was fixed when a bolt that wasn't replaced when the water pump was fixed.
Thanks for answering my questions.
This is my take on it. If I don't have to add oil, and it isn't making an awful mess in my garage, it can wait. If remediation gets down to "I wipe off excess oil film once a month", I can live with that. I can take the time to make a plan, and decide whether to trade it in, or just do it later if it gets worse.
This is more than an academic question for me, I have a 2010 Corolla. Like yours it is payed for. Unlike yours it has been 100% reliable for 162K miles, with nothing but maintenance and some safety recalls. Like you I don't love the interior and the handling is just meh. On the other hand, I love the transmission programming (can't say that about a rental Hyundai I drove), the reliability, the utility, and the economy. My current plan is to run it to 250K then sell it or trade it in.