100% agree with this dude. It's friggin' annoying when some website you're supposed to use disables zooming. Didn't know it could be forced. That's great.
I agree... for native apps it is very easy to have adjustable font sizes. But for web sites used in mobile devices, it's painful because we need to support all adjustable system fonts or do some tricks. Web sites blocking native (browsers or not) features like zoom are boring.
I did it for example in a game where two players swipe on the same screen at the same time, which could be interpreted as a zoom gesture, or a reload gesture, so I disabled both those things for hopefully understandable reasons. It's annoying that the only browser you can use on iPhones doesn't support this, it could at least be a prompt you could say yes/no to if they actually cared about accessibility, rather than making playing a game where it actually should not zoom, unfun.
That's why these tags should be supported. Because sometimes disabling/manipulating them is important.
It's just unfortunate that some developers abuse them when they aren't required.