The Human Target
Adventurer
Fair enough, but, it's not just a DM-Player issue. It's a group issue. Dumping it onto the DM to ensure that the player shines isn't fair IMO. If four of the five PC's all want to go sailing, then Mr. Ridesalot is up the creek.
The Human Target sums it up nicely. Any character concept which has restricted mobility is going to be very difficult to incorporate into a group. Never mind horse, what about flying mount? Great, my PC can fly around, reach places that no one else can.
Including the rest of the party...
So, I wind up hugging the earth with my winged mount because, unless I'm lone wolfing, I have to stay at least more or less, with the rest of the party.
It isn't limited to mounts, but, mounts are a prime example of this. Any concept which has restricted mobility is extremely difficult to have in a party.
Yeah its a problem in even more basic situations.
Say when 4 of the 5 people end up having a high Stealth sneaking oriented characters, and the 5th guy wants to play a plate wearing paladin.
The game is a give and take between DM and Players, but also between the Players themselves.