Hmm. It's a difficult question, but I'd like to propose having both a cast cap and franchise cap to allow for more flexibility: it would be fairer for both wide-spanning canons and for the point of a cast cap.
More specifically, in cases like Fate/ (or MCU/comics in general) where while there are many different spinoffs in the canon, many characters (the Servants, for example) are technically the same across canons, the franchise cap should be applied across the board (8-10 sounds about reasonable in this case).
For franchises like the Tales canons (or an alternative might be the Persona canons, which fall under the same umbrella), though, while there may be some minor continuity between games, most of the games can be considered standalone. It seems counterintuitive to apply a franchise cap here when each game can count as its own separate canon. In this case, I think each game should have its own cast cap rather than a franchise cap across the board.
In other words, cast caps should go to standalone canons, including standalone canons that are technically part of the same franchise, while franchise caps should be applied to cases where spinoff canons in the franchise are all technically in a connected universe with clear continuity and common characters.
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More specifically, in cases like Fate/ (or MCU/comics in general) where while there are many different spinoffs in the canon, many characters (the Servants, for example) are technically the same across canons, the franchise cap should be applied across the board (8-10 sounds about reasonable in this case).
For franchises like the Tales canons (or an alternative might be the Persona canons, which fall under the same umbrella), though, while there may be some minor continuity between games, most of the games can be considered standalone. It seems counterintuitive to apply a franchise cap here when each game can count as its own separate canon. In this case, I think each game should have its own cast cap rather than a franchise cap across the board.
In other words, cast caps should go to standalone canons, including standalone canons that are technically part of the same franchise, while franchise caps should be applied to cases where spinoff canons in the franchise are all technically in a connected universe with clear continuity and common characters.