Deconstructing old sequenced music and listening to the separate components is one of the most interesting things you can do, and an extremly efficient learning tool. Not just for learning how chiptunes were made, but just growing and becoming a better musician in general. Elements that sound very simple and detached on their own but fuse to become more than the sum of their parts, or just knowing when to kill your darlings (like getting rid of the root note of a chord to save channel space, which the bass is already playing anyway) is not just a chiptune thing but also arrangement 101 and ultimately a means to getting a well balanced mix (since arrangement and mixing is largely intertwined). I feel as though it's a skillset that is becoming more and more rare in today's production climate. Top-tier arrangers do this kind of stuff all the time even when they're not beholden to technical limitations.
I think it's worthwhile for any musician, no matter what genre, to dabble around with chiptunes. And by that I mean specifically working with getting the most out of these constraints and not just resorting to "bleeps and bloops" which is the usual reductive thinking applied to this type of music. It's such a great way of training yourself in these elements and really start thinking actively about them overall.
I have provided 2 "stem" archives for some Genesis soundtracks I find technically interesting, by just isolating the channels and rendering them into .wavs so you can load them all up in a DAW and thoroughly analyze what's going on in them. You can do this yourself using the [url=http://www.smspower.org/Music/InVgm]in_vgm plugin for Winamp with anything from [url=http://project2612.org/]Project2612
https://dl.dropboxusercontent.com/u/66640537/Thunder%20Force%20IV%20Stems.zip
Notice how the rhythm guitar here is split up into 2 layers with different sounds. One for mids and one for treble. Then these are "dubbed" once again and panned (as well as detuned slightly for a chorus effect), taking up 4 channels in total to create this huge wall of guitars that is pretty much equivalent of a fully fledged studio metal production.
https://dl.dropboxusercontent.com/u/66640537/Devilish%20Intro%20Stems.zip
I really like how the simple PSG squares synergize with the FM bells here to create a very vibrant sound. You can also hear how the "choirs" are really the same kind of synth string section you often hear on the system, but it just has this fast upwards pitch bend in the attack which adds this kind of formant quality to it that we usually associate with voices.