An interesting idea I had about stat caps would be to only cap the combat stats and let the crafting stats keep progressing. One thing I thought that was particularly cool was how important gilding was with the stat cap. Gilding allowed you to go beyond the limit of the cap with specialized equipment. It rewarded you for investing in your gear instead of simply your character.
The goal behind this would be to instead shift the focus of high-end combat onto crafting more powerful gear. I think the bonus of the gear would need to become more significant, but it would place more focus onto the industrial side of the game. Perhaps some way to create masterwork items that are a step above the rest would also shine here. The way that industry scales with crop growth, tree growth, metal spiraling and now clay spiraling would allow for the late-game continual growth of characters. At the moment, honestly having perfect gear is pretty irrelevant, when you could just force-feed yourself cheese.
This change would obviously require a rather significant overhaul of the stats of equipment and necessitate quite a bit of re-balancing. The scaling of attributes you gain from items could also be taken into account differently so as to make them more significant. For example, as it is, adding 10 agility once you already have 300 isn't that big of a difference. So giving more weight to stats gained from equipment would increase its value.
I hope I was able to convey this idea well enough. It'd be a pretty tricky overhaul, but I think it could be a pretty enjoyable change. It'd allow for having the "goal" of capping stats (I think some people particularly enjoy having a goal they can reach), but still give the ability to invest in your character by constantly working on perfecting its equipment.
The biggest flaw I feel is that once you can create one particularly high piece of equipment, given the current state of things, you could easily create 100 more. If there isn't a good way to manage this flaw, I'd probably say this whole change wouldn't be worth it honestly. It would take away from that feeling of being a titan when you could just hand your stuff over to someone else and have them suddenly close the gap.