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It's not that it is hard to build stuff from scratch, it's just that it is easier to use a tool to do it.

I worked on a project where we had to remove jQuery from the page, and it was a nightmare for all the developers that had never written vanilla JavaScript.

These days, I don't use jQuery or bootstrap, or lazy loading libraries because I can just add the functionality I need by myself.

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Be cautious removing and/or avoiding jQuery. I was once using it for something very small in a project and I figure what the heck I can just use vanilla JS for it so I removed it. I then had several bugs because every browser has its quirks even with very basic JS. I mostly use jQuery not because I can't do it in vanilla JS, but just because thousands of hours have gone into making code that will work across different browsers and browser versions.

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