LPs when properly played back sound lovely in their own right. This is not a competition. It is about musical enjoyment as far as I am concerned.
Not that it's a bad strategy, but as far as I know this would constrain one to using Denon, Ortofon, or Audio Technica carts, right?
I don't know of any other cart makers that still make matching SUTs....
ZYX was selling them recently as was Ortophon. But to your question, you can used a lot of OEM SUTs with other cartridges. They just need to provide the gain that you are looking for and you still must match impedance. If the SUT doesn’t have variable impedance selection then you just need to parallel the correct impedance resistors with the input resistors on the phono preamp side. I used to do that with a Denon SUT while running various cartridges. I soldered some standup wire off of the input resistors and then could easily solder the parallel resistors to the standup.
All that being said, there is no reason to use OEM other than that you might like the result that you get with it and you might get the correct impedance without having to do anything.