Very soon a new harvest bot will be coming. There aren't really "paths" per say, more "maps".
Last night I took 5 minutes to make a map and it ran for 2 hours and gathered me 1700 resources.
Since there isn't really a path, bots will never take the same route twice. Their start/end points may be the same, but how they get there will most definitely be different.
Still a few small quirks to be worked out, but it's coming to beta testing very soon.