Comment by b_e_n_t_o_n

I think if you're of the belief that JavaScript is bad and should be avoided when possible this type of thing is seen as an alternative to that. But we've seemingly moved on to server side templating, or dynamic JavaScript apps which solve the problems that XSLT does in a more ergonomic and performant way. Compiling XML templates on the server or at build time is perfectly fine and doesn't require browser support. Doing it on the client leads to performance issues that we saw first hand with older SPA architectures, and if that isn't an issue, client side templating with JavaScript is more capable and ergonomic (imo).