I think it is kind of unfair to call the Maori a Polynesian blob, unless you are implying (perhaps correctly) that all Polynesian civs are fairly similar and difficult to distinguish from each other. The Toa, the Pa, the Marae, are all specifically Maori features that don't have very clear or strong equivalents in other major Polynesian cultures, making the design far less blobby than Rapa Nui heads and Maori warriors under Kamehameha.
The only blobby things about the Maori are Mana and Kupe's Voyage. KV definitely isn't strongly resonant as a Maori thing, but if Kupe was the best leader option for the Maori to even happen, then it's a reasonable concession. And Mana is a generally Polynesian belief, so its' technically not wrong to include for the Maori. While I think it is fair to say that Mana isn't really in line with Maori history either, I also don't think Mana encompasses other Polynesian cultures so thoroughly that it prevents, say, Tonga or Hawai'i from having an equally distinct CA.
So really the "blobbiness" to me amounts to Kupe's Voyage, but even that isn't a completely fair comparison because neither Tonga nor Hawai'i really deserve to start in the middle of the ocean either. Or they are equally deserving. The design decision to make the Maori like this, in theory, didn't take anything away from any other Polynesian civs, other than making them functionally serve as a Pacific ocean generalist that discourages any other civs in the area. That doesn't really make them blobby to my mind, so much as having a sprawling design space. So I guess the distinction is semantic.
That said, I would wholly welcome civs that repeat gimmicks from previous civs. If we got a second Polynesian civ with a similar Kupe ability, but with a drastically different playstyle, I think that would make the game design feel a lot more balanced. Like say a Hawaiian civ that only wants to settle small islands, be pacifist, trade, and generate a lot of tourism. We could get some solid alt-civs out of this (Siam-Khmer, Portugal-Spain, Kiev-Russia, Huns-Scythia, Timurids-Persia, Argentina-GC, etc. etc.)