CodeIgniter 4 Important Features

MS is good example but its not correct to compare Windows with CodeIgniter.
Its very different if its made for Clients and if its Developer Tool.

I am against compatibility layers because we don't need them at all.
There is only 1 question which has to be covered BY DEVELOPERS when the new version is Live.
Do you have time for upgrading your CI 3 APP to CI 4?

If there is no time for an upgrade leave it on CI 3..
If there is time for upgrading move it to CI 4..

Why do you need compatibility if you are going to use an OLD app with new Framework ?
Instead of using the power of the new CI version, you will use it to copy the OLD version behaviour.. 
I don't get it at all ..

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