Given that this whole thread started because of a stream featuring Alfonso VI of Leon, it might be worth noting that the historical Alfonso VI of Leon did in fact legitimize his bastard son as his heir. Unfortunately he died in a battle with the Moors, resulting in a succession crisis, but he was treated as heir before then. And once you get out of Christianity, of course, it gets even more common.You provided a single example (d'Este) of bastards who were legitimized and able to enter the line of succession as a result. Your other examples are meaningless and essentially amount to a favour from the Pope in order for the ruler in question to save face - and usually these were political appointments of some sort.
Anthony of Burgundy is an especially odd example; he was never considered legitimate and had he been then Burgundy would not have been dissolved in 1477. The fact he was later retroactively declared legitimate by Charles VIII is completely irrelevant and was done more out of courtesy (or perhaps pity) than anything else.
The whole point of legitimization of bastards in CK is to put them into the line of succession so your game doesn't end prematurely; here, there are two issues: 1) should that be possible by default, simply because your faith allows it? To that, I'd say emphatically no, because it barely ever happened and you've struggled to find a single example of it doing so outside of my cultural criteria; and 2) should legitimized bastards take precedence over legitimate siblings in the line of succession? Again. that should be a no.
In summary: legitimizing bastards should be possible, but it shouldn't be something that is available by default.
This is clearly an example of an extremely niche exception which, bizarrely, you and others are arguing ought to be the rule. Why, I have no idea.
More broadly, while it probably ought to be more difficult to get accepted (in particular, I'd like either a vassal opinion malus or an increased "short reign" modifier), and the bastard should definitely go after any legitimate children in line of succession (sort of a reverse of the old CK2 "born in the purple" trait), it shouldn't be restricted to certain cultures. It might be interesting to have it tied to some extent to church authority, however.
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