According to the rules you hold the shield in one hand, which is true of many types of shield.
In addition, it means you can't have your paladin do things like cast a bonus action spell and then attack.
Like I said, I ignore it personally ...
Flanking is one that a lot of players seem to assume is in play.
It is not my problem. I tell players my house rules before the game. It is up for them to decide if it is a game in which they want to play.I would also like to ask:
How would you, as a DM, feel if a player was upset that you weren't using a certain common houserule?
I may or not play depending upon the house rules the DM uses. However, it is, imo, the DM's perogative to use the house rules they choose to run the best game they can.And how would you feel as a player if a DM doesn't use a houserule that you were used to?
Flanking is one that a lot of players seem to assume is in play.
The logic I have seen is as follows - the typical shield has a strap of the forearm, and a handle for the hand, and that hand can also grasp (but not wield) the sword at need. You use your free interaction with an object to shift the weapon to that shield hand.
Neither the sword or shield are useful for that round, mind you. When your next turn comes around, you use that free interaction to take the sword back into your weapon hand.