我覺得其實搞個輕規則應該還是很容易的？比如把什麼金丹期之類的境界當綜合等級，功法啥的當屬性，法術神通等等當技能，再加個什麼道途之類的來描述道德隨帶兼掉什麼潛力點，意志力的功能。戰鬥部分搞成三國殺那樣，社交挑戰和思考挑戰...嗯，就隨便弄弄，可以當簡單的連連看或者拼圖玩就成了？
Your "easy" ain't
other people's "easy".
Now, FWIS I actually think
you personally could probably do it if you so incline. Well, if I want to I could probably come up with something too I guess. (More interested in making a Shanghailander-type martial arts game though... Permanent backburner thing I probably won't get to do...)
It's about how much
one is used to something though. That's one important key aspect that most fall into: We gauge others' competency by our own capabilities/incapabilities.
It takes a bit of time to "get used to" designing, just like everything else.
And "light systems" are not as simple as one thinks:
Goal 1) You have a bunch of basic premises.
Goal 2) You need a system to cover all the aspects.
Result) You make a game with its own systems to resolve all the aspects needed.
Given enough spaces, you can always get a solution to make something works. (eg. The first-gen computers that're as big as rooms.)
And then you refine what you have, and make it more sleek and better. (eg. The current-gen palm computers we call smartphones.)
But, if you want brute force, size is still a requirement. (eg. The current-gen supercomputers like the IBM Summit that's about the size of a mobile toilet... Wanna say Phone Booth, but not sure if the kids nowadays know what that is... !!!=3=\)
Game systems are like that.
A game the size of 5e, can easily cover most everything needed, clearly and with extras.
But a light game that wants to cover a majority of what 5e can do, actually needs better internal balance, as well as releasing certain factors to downstream users. (The common Lite-game theme of "discuss with your GM what the positive/negative results are", is actually the attempt of handing system-load down to end-user level.)
So, creating a "lite" game that
works well, is actually harder than creating a 5e-type game, due to the needed experience and skill in refinement... Unless you're used to it.
Hence,
Your "easy" ain't
other people's "easy".
(And added to that, the common situation of " 'I wanna do something...' and then leaving things to the permanent backburner" thing that happens to all of us... That's another issue altogether... )
