Poll regarding CI 3.1.x to CI 4.1.x upgrade

English is not my native language and this sometimes complicates communication.
Two important points:
1 - I believe that I was one of the first to fully migrate my applications from version 3 to version 4, and I am satisfied;

2 - @mgartner, "a radical change, in my view, in the philosophy and objective of the framework." it does not necessarily mean that this has worsened the framework, remembering that the topic is about upgrading between versions, and in this respect the learning curve, and consequently the difficulties, is considerable.

I'm not talking about the difficulties I encountered, which were minimal, considering my level of knowledge, but in the posts about the difficulties encountered and reported almost daily in the forums and the example of building an app on the @includedbeer blog. There, https://includebeer.com/en/blog, a series of new resources and directions makes me believe in a change of philosophy, technically speaking, inherent. including the natural evolution of PHP in version 7.x.x.
Resistance to the new is natural, it forces you to leave your comfort area. I disagree with some things, mainly, from my point of view and limitations, of redundancy. But this is a matter of approaching the tool, I try to adapt to it and, whenever possible, make the reciprocal be true.