I think the issue of lash caps durability came from the days when ti valves didn't have steel tips, and you had to use them. They chewed on the valves pretty hard. I've never had issues with caps, on steel, or steel tip valves.

I would say JMO, if the geo is good without them, it's not worth the guide wear to crutch them off the retainer if your heads are already off, and apart. Assuming of course your valve train is in a fixed position.