It depends on the individual.
Some guys train stones w/out tacky, some guys never train stones w/out tacky.
Some guys have had problems with their elbows/biceps when they do stones w/out tacky.
For me, the lift/load changes without tacky, so there is not that great a carry over from no tacky to tacky training.
Unless you have a contest coming up that does not allow tacky (it happens), then there is probably no reason not to use it.
Can you develop better stone strength w/out tacky-- probably. But you have to weigh that against the cost of injury to your bi's/elbows. If you can train w/out tacky, and it doesn't hurt, and your stone lifting improves, then do it. If not, skip it. It does not work the same for everyone.