Sometimes practicality is of no concern. A Timex is far more practical than a Rolex. Sometimes people just want and there’s those willing to provide.An f2 lens of 14-28mm would be a technical feat that would astound the market. However, it seems to me to be the realm of a halo product with minimal practicality for the bulk of users.
I know I will get a hail of comments claiming "I will die without this lens.." but the fact remains that in only the most specialized cases would an f2 lens in this range show even a marginal benefit and then one has to contend with the issues of arising from f2 potentially erasing any advantage of speed.
Now, the 70-135 f2 is a different story...
This lens isn’t even on my wish list, but I still want it. The means to acquire are a whole other story. Ain’t gonna happen.
Probably a $5k lens.