I would also like to comment that while there are "cycling matters" cards, and those are """parisitic""" in the sense of only caring explicitly about cycling, the cycling mechanic itself can show up in whatever set.
That is both true for all mechanics, and 20/20 hindsight. When Astral Slide premiered, it was the first time they brought back a set mechanic, and the last time we had seen it was in Urza’s block, 4 years prior. Barring Future Sight, it would take another 6 years before we saw cycling again in Alara block. Cycling has become a much revisited mechanic, but it wasn’t at all clear at the time that that would be the case. Kicker and flashback have been used even more sparingly. Apart from some Time Spiral shenanigans, kicker would take 10 years to reappear.
Obviously, the change from three-set blocks to two-set blocks to no blocks changed how many sets feature a given mechanic, but also, mechanics from these old set have the advantage of time. We
will see the newer mechanics back in due time, and they do try to vary on themes if possible. Duskmourn had manifest dread after Murders at Markov Manor had disguise and cloak. Initiative is a variation on exploring dungeons. Surveil is a spin on scry, which itself has even become evergreen.