mamba
Legend
maybe not the most important one, but clearly a very important one.It's a problem because it seems every game design conversation is dominated (not includes, is dominated) by questions of popularity and profit, such that it is clearly considered by this community to be the most important factor in game design.
Let’s start with the obvious, no one wants to design something unpopular intentionally. If they do, they either failed at their design or focused on something that is more important to them.
Since we will never get consensus on what is objectively a good game design, you are then either going in circles about things that are just personal preference, or you have to look beyond that for something more objective - and I am not aware of anything that does this better than sales.
Does that mean 5e is therefore the best game for everyone, no, and that goes both ways. I would still rather play a 5e-like game with 10% market share than some PbtA game with 50% market share