fram
In the most basic sense of economics for prices to fall supply has to increase more than demand. If demand increases more than supply the opposite is true. There's nothing saying that a more supply can't also increase demand or even increase demand more than supply.
When more wealthy (or ambitious) people move into an area it often leads to that area becoming more attractive (schools, restaurants, entertainment get better) increasing demand.
Therefor there's nothing particularly strange about arguing that luxury condos could lead to higher rents as the op makes it out to be.
I think the attitude of doing less things better is quite common among successful software developers. It's just hard these days to have a good experience while getting to a level where these values matter.