Recycling was never a common practice, it's often just as time intensive and labourious to apply the old animation to a new sequence. It had greater visibility in long-running anime because those are the few formats where it actually works. And even then the entire sequence is just dropped into the script with no modification.
The Z-Move shots were not 100% recycled. As someone pointed out in Lana v. Guzma, a computer applies the background texture to the Z-Move so each one looks like it's being performed in the area where the plot is taking place. As opposed to speedlines like in earlier series.
So that's why they had that hilarious error with Lana's background in that episode. Computers, amirite? /s