CI 4 is awesome!
But.... We need the simplicity of Codeigniter with the libraries of other frameworks.
For example:
ACL (roles, permissions, etc)
Multilanguage support with .po .mo files
Command line
Form builder. Create forms from a class
ORM
CI 4 no accept libraries from third party in Core I think that is a big mistake.
This features should be included in CI 4 and the developers install this libraries from composer or other methods.
Or create CI enterprise edition but is not necesary.
Finally. Symfony and laravel for example it's much better than Codeigniter but i always use CI because is simply and easy to learn.