Lol, as the Etiquette Snob that I am…
When it comes to General Seating at a Wedding (so not the Head Table, or any specific tables put aside for the Bride’s Parents, Groom’s Parents, Bridal Party, etc)
I like the more traditional method, of mixed seating for a Dinner Party / Event… where one’s table mates are made up of those you know, and those you don’t
This ensures that anyone visiting from afar, who may not know sooo many, have folks to chat with.
Otherwise, the odd-men-out all tend to end up at one table… and that can be be a bit awkward, IMO
Truly, it is only for DINNER anyhow… because if one’s Reception has a Dancing / Social portion, then that is when folks tend to mingle, and move beyond their own table seating.
Hopefully, by that time in the event, the “newcomers” (in this example Paul & Diane Brown) have met some folks, and are a bit more comfortable mingling themselves
BUT it is always nice if say table mates Aunt Martha & Uncle Bob later on in the Evening when Cousin Joan stops by the table, says… “Paul & Diane, this is Joan, she is our eldest daugher, and cousin to the Bride… Joan these are the Browns, they are from ___ and went to college with the Groom”
But then again, one has to hope that the fine art of Manners & Introductions, might be something that your Guests are familiar with.