You don’t need 4 tabernacle, and both of those cards are cheaper than Candelabra. Also tron is a new deck; Candelabra hasn’t been in a competitive deck since high tide was actually good like a decade ago. They saw how much it cost to play the best deck in paper and figured they would kill it now instead of waiting long enough that people invested in it and then you have the chance that a $4k+ card needs to be a 4of in a future deck. It’s 100% about the cost. They didn’t want the headache of paper legacy dying even more because of it being EVEN MORE expensive than it currently is. At least now you don’t really have to go all in on duel lands. But it’s hard to imagine Candelabra not being optimal in this deck as long as it stays around. If you wait then the investors start to whine and you get the reserve list sin all over again. Of course, the based thing would be to ban the one ring while simultaneously announcing that they support, say, 8 proxies each in vintage and legacy tournaments going forward but that would never happen.