AE1 is probably easy because it has a simple design. There aren't many discreet "machines" in AE1. To make an AE system you need to know about controllers, cable, at least one of ME chests, storage drives, storage busses, data disks, the terminals, interfaces and if you want to go a bit further, import and export busses, the crafting multiblock and one or two extra blocks. The components of an AE1 system are all very intuitive and it is often clear from the names what they do. And they do there job simply. Compare the export bus to logistics pipes. In LP you can use extractor modules, quicksort modules, provider pipes, wooden pipes etc to take stuff out of inventories. Only one of those "machines" has a function that can be clearly inferred from the name.
I thought that AE1 was easy and simplistic (edit: by this I mean that I did not feel like spending an afternoon on making a simple ME system)*. I solved this personal problem by using other mods, often in concert with AE. Balance never entered the equation for me in the AE1 era. AE2 looks more complicated than AE1 did and I prefer the look of it, and that definitely is not a balance issue.
Just my 2 cents of course, definitely not a value judgement about anything.
*Ironically, after I had made 2 or 3 really complex inventory management systems I planned to go back to making a pure ME system for my main base. No messing around with storage busses etc. Inventory management had stopped being a gameplay priority for me, so I can see both sides of the argument.