Replacing a MacBook battery is a lot of delicate work. Not everyone has steady hands, great eyes, etc. For $300, the Apple Store is a better deal for most (and guaranteed to be a quality battery with warranty) compared to the difficulty of a $110 battery kit.
I don't want to use a 3rd party battery in a device I carry with me most places I go...
I re-did the battery on my 2013 MBP well after the Apple support period (~2020). I don't think I'd try it on a still-supported Mac unless I was very price sensitive.
I don't want to use a 3rd party battery in a device I carry with me most places I go...