Q:
Why Chrono's wells aren't unblockable ?
I think you’re asking the wrong question honestly. Instead of wondering why ours aren’t unblockable, we should be wondering why necro wells are. Unblockable attacks should be carefully selected and used, not be widely available like the unblockable spamfest that is necro wells.
I think our wells are fine as-is, and necro wells should have the unblockable removed.