The lower level spells (Weakness and Provoking Swarm) I still use, because there was no higher level replacement for them and they worked. Weakness I use all the time. Provoking swarm I didn't use often, but it did come in handy when LOM and I needed just a tiny bit more DPS to take down a mob.
By near identical, I was referring to Summer's Flame, which I had pre-LU19, and now is called Solar Flare.
The other two, were not replaced with same grade, so hopefully this is a bug that will be addressed via my /petition?
What ticks me off most about all of this though, is that I had just had those spells upgraded over the last 2 weeks. I knew LU19 was coming out, and so I constantly checked the test notes, to see if Priest/Druid/Warden spells would be affected at all.
Had there been even an inkling in test notes that hinted at changes to my spell lines were coming, I would have held off, but seeing nothing at all besides our Nature's Ally mentioned in any of the test notes, I felt that it was safe to go ahead and upgrade them.
Even the LU19 patch notes, make no mention whatsoever, about any of these changes. That's what bothers me the most. I'm far from rich, and the 15 or so plat I spent upgrading those spells, is a huge blow to my wallet.