Me? A kin of LadyGoo? Are You nuts?
I know I'm a chicken legion and I must be cited more than once, but all means, You know shit Sherlock. Middle finger on runestone goes to You.
Stupid decay mechanic for character is like using a carrot rod against donkey, with exception that You won't let the donkey touch it. Not to say, that, it's not mentally health to know that You not only lose because You stopped walking, but You're also being pushed by magical Granger hand back, just because He thinks a decay will change something against big guys or LadyGoo special forces.
If I stop playing because X happens and I come back to see that people once I know are titans now and I am reduced to half or more of what I was will just simply prompt me to join the "new world" guys it also can mean I lost my base, I lost my almost entire progress. There's enough of lost as it is if You stop.
If I could close the gap of what I lost simply in one day, then what's the point, just waste of time? The problem isn't lying that stats are endless, it is just that it is hard to catch (not impossible, but hard).
It's better to either make progression logarithmically decrease (midgame being fastest point in game to increase in all matters, slowing down greatly in endgame), so if the world is going to be a longer one, new players / vet can still come back in game and somewhat catch up to players from very beginning, but by catching up I don't mean they deserve to be in same position as longtime character, but catch so close enough that they can make the difference in some way or another, instead of being laughed in the face.
I quick ways of I can think of is:
1. To make armor and weapons making a huge difference instead of stats, where 1k or 2k in stats just give some small % that is meaningless for solo player, but becomes something to be aware of in group.
2. Nerf greatly symbel and increase / rework a bit FEP so it is a much harder to gain stats
3. Give a % bonus based on best character in the world for new players / players very far behind
Decay in any game, that touches player directly and is a MMO, is very hostile approach against a player. You want people to play the game right?