Stall also got mega ampharos and mega scizor, along with defog working with one of our staple pokemon, skarmory. Mega Tyranitar, Mega Aggron, Mega Blastoise, mega gyarados,
Apparently, it took all of you until this generation to discover mandibuzz, but I guess if you want to call mandi's usage an acquisition to stall, that's fair enough. C05ta had a really good team with her last gen and I used her on occasion, when I didn't like sigilphy more.
Clefable with fairy typing has become a really good stall pokemon. It has a fantastic move pool, recovery and a wonderful ability set in unaware and magic guard. I personally prefer magic guard, but hey.
Florges, Chesnaught. Aegislash, Goodra, Sylveon and some intermediate fast pokemon like Zygarde, Delphox and Gourgeist are also available for us to use. That's about 40% of the viable pokemon this generation, TBH.
But really, as far as I'm concerned, defog is the greatest thing that has happened to stall, ever. I no longer need to rely on bad spinners to keep my cores intact.
But even with these being the major additions, stall has probably changed more than any other style at this point, besides maybe the ideology of a hyper offense lead. Stall has more firepower, but it will differentiate itself from bulky offense in a few major ways.
A. Setup sweepers do not exist anywhere on stall. Setting up, in general, does not happen beyond hazard set up.
B. Cleric staples. We use them all the time, bulky offense might not.
C. EV investment. We're almost 100% into health/defense, whereas bulky offense will run speed creeping and attack power to secure KOs way more often. Although, I am running this ideology on a few pokemon... but that was mainly because of lucario in which it's the best way to secure my kill on it. Generally, however, we spend EV investment to AVOID certain kos/add more bulk.
D. Endgames are way different. Stall endgames are pretty situational and can be really difficult vs substitutes and magic guarders, whereas bulky offense will generally have sweepers/cleaners that start when the opponent just has good damage on him across the board.
Personally, having almost completely finished my first favorite stall team and having one more that is ready to get tuned to that level, I can't honestly say that stall is hurting too much. It takes a good deal of creativity and thought, but that's why I enjoy building stall teams anyways.