Mostly because the rune pools (at least in FS, once again) are getting a bit deeper. It is a lot less obvious what combinations of runes are best, particularly with the healthier/deeper themes like boghoppers, psychics, and semi-aquatics.
Salaman have more clear champion choices, but the various ways you can build the non-champ selection can result in interesting discussion. And of course there is meta! Though there is also a lot less meta discussion. Snaptooths are decent too, though there aren't really that many snaptooths so build discussion is a lot less important.
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