The original poster is saying that as founder, no one cares to the level you do, no one else has as much at stake, others care but to a point.
The original posts point is that as founder it’s really up to you and no one else.
If this fails, as founder you lose all the things you risked, possibly everything you have. No one else is likely to have as much at risk as you. This means you care in a way and to a depth no one else does.
Of course others care, of course your grandma cares, of course your momma cares, of course head of marketing cares and of course the investor cares, but none of these people have everything on the line.
Everyone else except you can walk away. No one else is going to relentlessly hit this problem till it’s solves except you.
That’s the point.