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SO has plenty of Q&As about how to accomplish various tasks using dynamic SQL, frequently the responses are accompanied with warnings and disclaimers about the advisability of actually using the approach provided. I’ve worked in environments ranging from ‘knowing how to use a cursor is a bad sign’ to ‘isn’t sp_executesql neat!’.
When it comes to production systems should dynamic sql always be avoided or should it have a valid place in the programming toolbox. If not/so, Why?
Answers to some of your questions can be found here The Curse and Blessings of Dynamic SQL
Sometimes you have to use dynamic SQL because it will perform better