/ride command (Bedrock Parity)

The /ride command from Bedrock 1.16.100 should be added to Java edition because there is currently no equivalent command. You can summon new mobs with riders but you cannot use a command to make existing mobs (and especially players) ride a vehicle or other mob. This would allow for several creative opportunities for datapack creators such as adjusting stacks of mobs to change phases of a boss or teleporting a player directly into a boat for a minigame. You could even create a datapack to allow occupied vehicles to travel though portals by ejecting the player and then placing them back in the vehicle on the other side with this command.