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Doctors recommend a lot of things due to herd mentality and syllogistic thinking. Their endorsement doesn't mean much.

I assume it's difficult to grow fresh tomatoes there too. Why should the tomatoes be benefit over the existing supplements?

Tomatoes are still eaten plenty in places where they cannot even grow, because we are able to ship them. They may not taste as nice as farm-fresh heirloom tomatoes, but clearly people still eat them.

On the other hand, most people do not take Vitamin D supplements, even if they should.

Ok... but why would these people who don't take a supplement today suddenly care enough to pick out fresh tomatoes that are engineered for it? Likely at 10x -100x the cost.

CRISPR doesn't only work with tomatoes.

This is an argument for preserving salmon habitats, which is how pacific northwest tribes met their vitamin D needs before we dammed their spawning grounds.