So I’m making a case here that you should tend to prefer mature things, and you should try not to use too many things.

But it’s not an absolute principle. Obviously sometimes it does make sense to add new technology to your stack. And it can even make sense to use a weird new thing.

It is always good to stick to/use technology which has a proven trackrecord and is known well by you. But as always your mileage may vary and as always the answer in technology is: "It depends".