I'm not a player or GM. I make 2d6 encounter tables and plan encounters for fun.
I'm moving from 5e to Shadowdark. It's rules light and any holes that come up is filled with my experience with 5E and other systems. I had the biggest grin on my face as I rolled a 1HP NPC. Each of the 4 classes is on a 2 page spread. Simple and easy. The amount of random tables in this book for the GM to quickly use is incredible.
Players may encounter undefined rules. It's commonly mentioned the stealth section is a bit vague, forcing the GM to make a call on the rules. It's a sacrifice I'm willing to take to lighten the crunch.
You should definitely download the FREE quickstart rules and run Lost Citadel of the Scarlet Minotaur.