It seems not a few people here don't like Composer.
Personally I think now Composer completely took over the place where PEAR was before.
I think we don't have to worry about Composer decline. Now is the time it grows.
But the cautionary tale of @cartolot is true in the long term.
After all, the current policy of CodeIgniter seems to be good choice.
> Composer will be an option, much like it is currently in CI3. v4 will have it's own PSR4-compatible autoloader.
If you don't want it, you don't need it.
If you want to use it, you could use it perfectly.