Is CI outdated ?

But, before doing that, I showed it to my friends. Here are the responses :

The responses you shared sound like follow-the-crowd reactions, not technical analysis. You need the latter, not the former. As others have said, every choice will have pros and cons, you should select the technology that best meets your needs. That includes "performance" (if you can accurately measure it), ease of coding, compliance with any pertinent requirements, etc.