One should purchase a K&N Air Filter if they wish not to purchase another filter for as long as they own the car. That is the only real "upside" to the purchase. Can the filter allow a greater volume of air pass through? Sure, absolutely. But, the vacuum on the piston down stroke will only allow so much air, that it may defeat the purpose.
One thing that people need to understand, is that no matter what aftermarket equipment one installs on their vehicle, the main role of the Engine Control Module is to correctly maintain a Stoichiometric value of 14:1 air/fuel mixture ratio. If you add more air, the MAF, MAP, and other intake sensors may pick up that extra "volume", then adjust the injector mapping to compensate, usually a bit richer, thus affecting your MPG. There is always a cause/effect.
I've had plenty of customers come in, with this, that and the other aftermarket "performance" enhancer installed, and wondering why their Check Engine light is on... Engineers design things for a reason, and those with standard ICE vehicles always seem to know more than the engineers...
In my experience, unless you're building a high performance vehicle, keep the replacement parts OEM... Sometimes it's just not worth the extra price...
I've got 30K miles on my '19, and outside of a couple of flakes, it still looks clean... I blew it out with compressed air, and reinstalled...