[thraxil]

Yes, it's exactly like having a bug in your code. Using Templ means that it gets caught at compile time (if not earlier since your IDE can show you that there's a problem as soon as you write the code). That's (IMHO) almost always preferable to catching it at test time.

[verdverm]

You have to introduce a new tool to your box and run more commands, so it is not free

people have a resistance to increasing tooling, and especially learning a new syntax or language, for a small task in a larger project

Since we test already, adding a test is often a much easier ask and lift

on top of that, you still need to validate inputs and test rendering with Templ anyway