First of all i would like to say that I am french so do not flame me for bad english.
The utility for this prestige system is that people will be able to push for higher greater rifts (60-90).
So basically this system is that you can prestige (get back to level one and farm till level 70 preferably only solo) but you get a bonus. The bonus in this case is that for each paragon level you have you get a ''level'' (the items scale up with your level in this game) so basically each level after 70 could grant items +2/2,5 dex/str/int, 0,004 for cc/cdr and 0,10 for chc and maybe +0,50 dmg for weapons (obviously I can't really say this is balanced since you can't really test this anywhere) but you get the general idea. I think you should be able to prestige only after a certain paragon level and only once during a period of time. With this people could get way higher dmg and could push for the grifts. The only problem with this system is that t6 would get so easy it would be like normal so I think there shouldn't be a cap of what torment you could do some people may be able to do t10 other t20 while getting increased exp and gold dropd BUTDOES NOT INCREASE LEGENDARIES DROP CHANCE since t6 rifts drop chance is pretty high already.
To finish I would like to say that I did not read of this anywhere so if this idea was already said I'm sorry to waste your time. (hopefully you consider how this idea could improve the game).
I like the concept, but would almost prefer to just have the paragon system reworked to account for this.
I understand they do not want to just give people with more time a complete edge, but lets all face it, people with more time have an edge no matter what you do.
With this being understood, I think it is time for the Dev Crew to recreate things that are more "planned" by the character instead of "RNG" by the system.
For instance, lets have enchanting an item be for all item slots, but lets also allow the user to choose the stat they prefer, but rather than say 8-10% cc, have it be 1-10% cc, and instead of as cheap as it is, make it cost 25m gold, 500 blue mats, 500 yellow mats, and 25 souls. This means that farming is still essential, but other than drops, you have a chance to actually plan out what you are farming for, rather than it being completely random.
I have a million other ideas, but for the sake of this topic, I wanted to keep things somewhat on track as I think your idea brings to light a real issue at hand with a main question: "Does the Dev Crew care?"
I mean Diablo is a kind of game based around RNG by what your saying so they would need to allow you to craft every item in the game but with very high prices, 200 souls or so to make it more planned? You can't just say every 200 kills you will get a leg of your choice, but what I think they are trying to achieve is that no mather what leg you get you still can make a viable build with it but in this meta it is nowhere close to be this but it would make the game a lot easier/enjoyable? They are getting closer with the season items and the new sets they put out but people already have their sets maxed out which work already so they would not tend to change as much. I see your point of view but what I was trying to do is to make grifts more reachable since grift 60 is like pretty hard but they put in 100 tiers... I would think that diablo is a game that shouldn't have really a end game so people could enjoy it more but others at the same time would get overhelmed and just quit. I think this depends on everyone's POV.
When it comes to ''Does the dev crew care'' question I think they are trying to find a way to make grift 100 possible but I don't think it is coming soon...