Exactly ... front fully locked aint that bad (it aint a 4300 lb vehicle), and it's only "locked" when the hubs are enguaged.
As to tire wear ... I have a mini-spool in my 2dr. Now, it aint a DD, but I drove it quite a bit on the street (store runs, to the trail and back, etc), after 4000 miles I couldn't tell the difference between front and back wear (yup rear "chirps" but I think the lightweight just keeps the added wear from being too big a problem).
Just "my experiences" ... YMMV. On a DD, I probably wouldn't want weld/spool, but if ya got it, go with it.
BTW, A 2000lb vehicle and a 4000lb (or 6000lb) vehicle will have DRASTICALLY different experiences when it comes to welded/spooled diffs.