I've had a lightbulb moment over past 24 hours on how useful the template node can be
Previously, I'd only ever used it in one flow (and I'd only copied and pasted it so didn't bother working out what it really doing)
I'd only noticed it mentioned when people were talking about stuff with http in/out nodes or dashboard stuff (neither or which I really use) so I just let it woosh over my head.
But I've just realised it it is a VERY simple way of prefixing and appending text to payloads and means I don't have to write JSONata in change nodes or function nodes to get simple jobs done.
So for any others who missed using it simply - here it is
If you have a value (lets say a temperature reading) in msg.payload, then to make that into a nice readable string then simply stick a template node into your flow
and amend the text to way you want it
I'm now off to amend my flows