I prefer to have my hands greased, and not with mayonnaise,
I only lube my brushes when I strip them down, and I only strip them down when they stop performing as I would like, now and again I use 3 or 4 different brushes and I forget to clean or insufficiently clean at least 2 of them, I generally lose the plot when there is so much going on.
I stripped, cleaned and lubed all my brushes just before the paintpals started, but only because they sat for months doing nothing.
If you are using your brushes frequently and they perform well, there is absolutely nothing wrong with them, nor do they need attention, generally if you thoroughly clean them after use, and you don't need to strip them to do that, there should be no need to do anything except enjoy them.
I only ever use water based paints, after use I clean first with water half filling the cup and with a rag on the nose, I blow back only and empty the water out from the cup, but not through the brush, after that I use the the airbrush cleaner and again half fill the cup and putting my hand over the cup shake it vigorously and then blow everything through, I then finish off by rinsing with water, I tried missing this stage but the cleaner dries in and leaves a sticky mess in the brush, then I need to strip.