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React feature guidelines?

I think we should try to come up with some consensus regarding how to use the new [reactions feature](https://meta.codidact.com/posts/284455), more specifically the "outdated" and "dangerous" options. Which kind of posts should these be used on?

Otherwise, I can see how these quickly turn subjective without some community consensus or guidelines. There are a lot of old things that could very subjectively and arguably be classified as "outdated". Though there may be perfectly valid reasons why they are the correct choice: price & availability, EMC, tool costs and so on. 

For example, if it was up to me personally, I would for example flag any solution using 8-bit microcontrollers as completely outdated - which I realize is quite controversial and something that would immediately spark some off-topic 8-bit vs 32-bit debate in comments.