Grappling, in my experience, has long been a mess as far as the rules go. It's just been hard to remeber the rules and to use them at appropriate times. Often it is easier to just swing a weapon at a target rather than use the sometimes amazing grappling technique.
In D&D 5E 2014 (known as 5E to me), there was an opposed challenge to start a grapple which repeated. No big deal other than having to figure out what ability each particpant was using make a pair of rolls add mods and compare. Well that's all changed in D&D 5R 2014 (known as 5R herein).