You can, the PinePhone is just a Linux device after all. However, on a slow phone like the PinePhone you'll really notice the bloat and overhead the web stack adds to your programs and native tooling is a breath of fresh air.

I don't understand why you'd want to drag the web into a phone GUI.

> I am just thinking can't we use web technologies for this instead?

Please don’t…

Assuming you want to have people download a massive electron app to look at cat videos.

You can use any technology you want that runs on ARM Linux for the Pinephone.

But the hardware is very slow compared to pretty much any other modern phone, you will struggle to get decent performance from web technology.