In an open world game like this, there's no gimping like self-gimping. PC players are the lucky ones, they can play with mods that impose stricter RPG challenges.
Personally I miss some of the more "traditional" RPG constraints such as:
- Straight warrior classes can only wear the heaviest armor no weapon restrictions. Spellcasting is either prohibited or severely restricted to the simplest spells.
- Hybrid warriors like Paladins, Spellswords etc. are restricted to Chain maybe Scale to allow for more complex spellcasting movements.
- Certain classes like Paladins and Priests are restricted to Maces and Hammers because they aren't allowed to draw blood (Though bashing in skulls is somehow OK LOL).
- Thief/Rogue types are restricted to Leather type armor and lighter one-handed weapons like daggers and short swords for the stealth bonuses.
- Pure spellcasters/priests are restricted to Cloth/Robes to use the most advanced spells. Backup weapons are typically restricted to daggers and staffs.
Granted such restrictions are better suited for multiplayer RPGs where the players/classes can assume the more traditional "RPG Party" roles of Defender/Tank, Stealth/DPS, Spellcasting/DOT, Support/Crowd Control, and Priest/Healer. But even in a single player RPG game like Skyrim it's nice to have certain class type constraints. The Perk limit does help in this respect since it forces you to focus on certain skill sets making a hybrid class that suits your play style and it's impossible to be godly "master of all trades".
I also like some of the newer Computer/Console based RPG elements like the "hardcoe Mode" of Fallout NV, where among other things you would have to manage food, water and sleep. The fact that there is no such mode in Skyrim is a step backwards for me and I can only hope that such features get re-incorporated into Fallout 4.
Personally I'd think it would be cool if there were different modes available in game that would force you to adhere to certain constraints such as the "Checkpoint Only" saving like the OP mentioned or the truly hardcoe constraint that some players practice, a "Dead is Dead" mode.