Loads of better routes in Wales, in fact I’d say pick any other bar the Gower loop.
The Gower loop is local to me, and was devised by people I ride with (or have ridden) based on the obvious classic loop. But it’s always puzzled me because it’s not quite long enough to make a decent weekend’s bikepacking trip, imo. It’s a longish one day loop from my house, but breaking it into 2 parts would make it too short. And it misses out on some of the better obvious and not so obvious trails – but that’s the advantage of local knowledge.
The only downer is the ride in to and out of Three Cliffs Bay. Deep, soft sand is unrideable!
Did you follow that bikepacking.com route? Both sides of 3 Cliffs Valley are rideable, unless you drop in from the Pennard side which takes you down the sand dunes. The bikepacking.com route doesn’t go into the valley and doesn’t include any beach at all, from what I can see. Maybe it’s changed?