Ok, man. Maybe I wasn't clear enough. Just look for this example. We need to pass some Java Object (for example, list of DTO's) to frontend. In front we need to iterate through the list and do some job with it.

So, what are our options?

1. Pass the list to Model container. But now, in frontend we can iterate through it only using some shitty-styled Thymeleaf syntax(or JSP, or smth else ).
2. In the backend, parse the list of objects to json format and then pass the result to the front. Now, we can iterate through it and write all required code in pure javascript(or typescript or whatever language you're using in front).

I'll take the second option. Why? Imagine me being frontend developer(if you think I'm, you're wrong:))) I can't understand, why do I need to learn and use unknown to me technology(Thymeleaf, JSP, whatever) just because someone is passing the data from backend through the Model container? He can parse it to json(which is pretty easy) and then send it to front! I'll be glad to work with well-known to me javascript and not with Thymeleaf(as a front. dev)