I really like running D&D 5th edition with just the free basic rules. I find it to be a simple elegant set of rules in and by itself.
Adding the occasional background or other options from the full rules set for flavor.
But I've been thinking, can I make basic D&D even more basic? Can I trim even more fat? I believe I can, here is how.
I propose dropping skills all together. That's right, no skills. Instead characters get their proficiency bonus to all rolls. Proficiency is the characters power level and experience. Like old school D&D weapons are restricted to your class proficiency weapons.
When characters make a roll that involves the characters background in any way, the character has advantage for the roll. If the character makes a roll appreciate to their class, they have advantage.
I haven't tried this yet. But I hope to soon.