I think your first reason is the main cause of that eighty-something percentage of websites. There is a huge number of websites based on wordpress, and they all have jQuery.
I personally write a mix of vanilla JS and jQuery when writing javascript in wordpress. In most cases I prefer vanilla JS, but sometimes jQuery just has features ready that I need and... it's just there, you know?
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I think your first reason is the main cause of that eighty-something percentage of websites. There is a huge number of websites based on wordpress, and they all have jQuery.
I personally write a mix of vanilla JS and jQuery when writing javascript in wordpress. In most cases I prefer vanilla JS, but sometimes jQuery just has features ready that I need and... it's just there, you know?