I'll come right out and say that I have not read the entire manual, but here is what I love in CI3 and don't find it in CI4:
1) Adding something to config so I can use it anywhere. I'm talking about
$this->config->set_item() and then later being about to use
config_item() to get the value. This was super handy, as one could pass values to almost anywhere.
2) Adding vars to views with
$this->load->vars(). Similar to config->set_item(), being able to set vars that were available in any view was really handy in CI3.
Please let me know your CI4 secrets.
