I like the convenience of a griddle in the kitchen space (I don't have one built in, but camper came with the 17" griddle.) I found that the griddle itself is pretty insignificant, doesn't heat well, evenly or provide enough surface area for much food. the griddle itself is much more shallow in width than a Blackstone brand and the sides of the plate or not high enough to be efficient during cooking.
I realized the space was best for all the stuff I like to have for grilling and instead have a portable Blackstone. I initially thought it'd be too heavy and bulky, so used a portable Weber gas grill, but found myself missing the flat top cooking. I found a really good deal on a 22" Balckstone on FB Marketplace. Turns out, it's not that heavy and stores/fits nicely in my front passthrough. I love having both to use...as I like to grill and I like the flat top for a lot of other stuff.
I added a 2 way splitter to my camper's propane quick connect. when I go out and set up for extended stay I set them both up (Weber traveler/Blackstone Adventure Ready) so I can chose which one I need. It might seem excessive to some, but I like to use them and I also have a sister who loves to cook. She comes camping with me and makes all kinds of good food. You can't use them both at one time, but at least I don't have to move hoses.