Depends, people seem to appreciate being surrounded by green stuff for esthetic reasons. And there also positive side effects on air quality. You can actually improve air quality in a lot of buildings simply by doing some indoor/vertical farming. IMHO it would improve most offices I've been in. Also more green outdoors, would probably be not a bad idea in many cities. I was debating this with a friend some time ago while looking at the blank wall of an apartment across his street. Unused vertical space blasted by the sun most of the day. It gets hot indoor because of that. A layer of green would definitely help. Add water and nutrients and you have a farm waiting to happen. Also, it might look pretty and provide some space for birds and other critters.

The point being here is that this is not a zero sum game; there are many benefits to growing stuff other than producing food.

A lot of the vegetables grown in Dutch greenhouses mentioned in the article are actually exported; though other countries are starting to do the same now.

This area here is the most well known and largest greenhouse area in the Netherlands (and probably world wide). It's comparatively tiny (about 100 square KM). https://www.google.com/maps/@51.986133,4.233423,25389m/data=... https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21986

The reason greenhouses are used there is because they produce way more per square meter than traditional farms can. That and access to cheap gas decades ago caused a boom in greenhouses to happen. Currently many of these greenhouses are switching from gas to clean energy. Over the last 4-5 decades, local farmers have optimized their production and they now run very efficiently.

The Netherlands is (by far) the largest exporter of tomatoes world wide. Most of those are grown in these and similar facilities as well as many other crops (i.e. this is not dedicated to just tomatoes). It's a vastly more efficient way to use land. The point here is that it doesn't take much space to feed a city.