Why the hate for CI still

I've found no real downsides to using CI3, and may keep using it even after CI4 is launched.

Same here.

Although I am looking forward to what learning CI4 will teach me about PHP, because I learned so much from using CI2 and CI3. Although I fully expect to use CI3 for quite some time after CI4 releases, I am sure CI4 will actually be much better, and am so confident about the CI team and direction of travel, that CI4 will probably be the driver for me to learn all those unknown unknowns that lurk unnoticed by me in PHP. (I am self taught, no formal training, and as such still find gaps in my knowledge that surprise even me).