[split] CI4 vs CI3/CI2

I'll let other's answer why they like it/don't like it. But I did want say two things real quick:

1. No need to upgrade your previous sites to v4 if you don't want. CI3 will still be getting support for quite some time, and your current sites will keep on working just fine.
2. Namespaces are fairly easy to wrap your head around once you dig in. I've created an article that explains them and how they work within CI in a pretty simple, clear manner, I believe.

Hope that helps!

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