I agree with this, but I would add that it needs to be in the Players Handbook. I think the disparity between long/short rest classes based on the number of encounters per day is probably the biggest problem in 5e. The different short rest lengths needs to be a core part of the rules, not hidden away as an optional rule in the DMG. There should also be different adventures using the different rest lengths to showcase different playstyles.It should default to one hour, with a sidebar discussing how different lengths affect the game and what playstyles each pushes, along with a very heavy, "DMs, you may want to adjust how long this takes in your game" message.
The rules should also explain how a DM can change the length of short rests based on the circumstances. For example switching to an 8 hour short rest for long periods of traveling, or 10 minute short rests for large dungeons.
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