[2019] Here are the before-and-after stats for Inferno Tower and Royal Giant, as promised. The link to the original post is in the comments. According to the stats, Inferno Tower is NOT useless and Royal Giant is NOT overused. They are both very balanced after the update.

Hey, great follow-up! As promised, some stats as well:

Inferno Tower: the card is hovering around 48-50% win rate on the Ladder, 47% in Classic Challenges and 44% in Grand Challenges. Although it has dropped in popularity a bit, it is still #1 building in the game and has a 12% use rate on the Ladder. Use rates in CC and GC are 10% and 8% atm (used to be 17%).

Royal Giant: 50% win rate on the Ladder, 49% and 52% in Classic and Grand Challenged respectively. Use rate hasn't changed at all, being at ~6%.

On a side note, I think one of the IT nerf's side effects is that Inferno Dragon has become a bit more popular in competitive play. It climbed from 10% to 14% use rate in GC and now has a 52% win rate.