I avoid using the tag() function now as I always hear @pturmel 's voice in my head telling me it’s bad for performance 
tbh though, I haven’t had any issues with using it in the past, but that doesn’t mean it wouldn’t start to cause issues the more components you add. Better to build optimisations in rather than have to refactor once the bottleneck hits 
Edit: Oh, I didn’t realise he replied here as well, haha. I’m also a huge proponent of not using UDTType properties on templates, and as Phil said, pass in a tagpath instead To UDT or not to UDT. That is the question - #15 by nminchin