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Developers don’t need to think about whether or not the data they are putting in can have special characters - which is common source of bugs in web applications. The templating library will always do it.
The ‘library’ can be expressed in a few lines of Javascript - so no big mystery on how it works.
There are no fancy callback features to tempt developers to write complicated code.
There is no caching - but we don’t have 600 extra lines of unnecessary Javascript and caching takes extra memory and is probably premature optimization and our simple code will be faster anyway.
Putting the responsibility elsewhere for handling logic in absence of data etc. Encouraging separation of concerns.
There is no danger of the templating library becoming a crappy language.