I'm not a programmer per se myself, I run my own Linux server and dabble with vue and other stuff, it's definitely been beneficial to me as a designer. Having tech knowledge, especially on the stack used, you get a good idea of what's possible to even do and where design starts to be a hindrance to the building of a product. It has helped me communicate with the developers and while it doesn't help me design, it still is beneficial to the product as a whole.

I don't think that designers should have to know development well enough to be able to build the whole product, but the more you know, the better it is.