Generally I find many these frameworks will make some complicated things simple, but the cost is some things that were once simple are now complicated. They can be great if you just need the things they simplify - or in other words can stick to what they were intended for, but my favorite way of keeping things simple is to avoid using complicated and heavy frameworks.
Out of the box, Vim’s default configuration is very basic as it’s trying to emulate vi as close as possible. It like if you want things like headlights or a heater or a tachometer in your family car, you got to create a vimrc and turn those features on. That was my experience when I first started using Vim - I spent a lot of time messing around creating a vimrc until I got things the way I wanted.
One of the big changes with Neovim is their default settings are a lot more like what you would expect in a modern text editor.