What questions should be tagged with [best-practices] tag?

We used to have best-practices tag before, and now it has been reintroduced again. The tag wiki states:

Questions regarding architectural approaches, coding standards, or methodology. The question should be more than simply asking if a specific, tiny snippet of code is "good." It should ask about broader patterns or strategies for solving a class of problems, inviting answers that explain the reasoning and tradeoffs behind recommended approaches.

We used to close questions asking for something that is "best" because this term is highly ambiguous. However, if the OP explained what "best" means, then the question would have been accepted on the site. After all, answers on Stack Overflow should always provide best practices; those that don't attract downvotes. So questions asking for best practices weren't inherently always off-topic.

However, there were some questions that would always attract only opinionated answers with no way of determining whether something is objectively good or just a matter of taste. Coding standards are one example of it.

In my understanding, the purpose of the new tags is to allow the content, which previously would not be acceptable, to find a place on Stack Overflow. Thus, the new tags should not be applied to questions that would previously be on-topic. The new tags should only be used on questions that seek out only opinionated answers.

What is the community's view on when the best-practices tag should be used?