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My POV: I have plenty of stuff with oil bath/oiled foam air filters- old VWs, old B&S engines, somewhat newer B&S engines. They are all a pain in the arse with the seemingly constant service requirements.
And, IIRC, I read somewhere that they don't even filter as well. Seems hard to believe bubbling air up through a vat of oil wouldn't catch everything...
Newer equipment with paper elements = tap and/or blow out some dust occasionally. Hardly ever need to replace.
My cars must see unusually clean air duty as service intervals are long and replacement intervals nearly non-existant. My mowers and other small engined stuff do see lots of dust and whatnot but even then the only times I've had to replace paper elements was when they got gas soaked- they wouldn't flow after that.
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