iJackUA

Yes, they really have similar parts (mostly Operation and Action). But Hanami is a framework and Trbr is a architectural layer, that could be used inside any framework. In Trbr I really like the idea of Representable to convert objects. Trbr is more tailored for Raiks, to allow step by step improvement of existing Rails apps. Maybe it is not so important for Hanami, but with Sinatra it will still help a lot.

I haven't used Sequel by myself, but definitely, need to add a mention about it. Thanks!

There are a lot of "emotions" and personal opinion that is not wrapped with tolerant euphemisms. I don't have time to explain all POVs in details, also even after reading those books I mention - every person would have his own opinion and conclusions.

Linux is mentioned because it is a common server OS and Linux knowledge is the most helpful for web dev. OSX do not add any extra value to this aspect of knowledge (despite I do use OSX as desktop OS).

Try to use Trailblazer. Even if you would not adopt it entirely - it is really a great way to broaden your perspective. An Editor is solely personal taste.