Seating cards all depend on the people making the simcha, the type of guests, the location etc. It really is all relative (no pun intended)
In Israel even if you have seating cards – no one ever looks or bothers with them unless they can be used as a toothpick. Otherwise they are ignored. Elsewhere people anyway chop and change if they don’t like where they’ve been placed.
So……my take on this is quite simply, if it makes you happy and you can bothered, then why not. If you can’t be bothered and it will cause hassle and or grief then don’t bother. Life is too short to worry about seating cards , believe me.