>>43304079I interpret the links in two ways. One, they are determining the maximum power of the spells you can attain (common, uncommon, rare or very rare). Two, they are providing you with intuitive knowledge of a selection of spells that you can master with practice and dedication.
Softcap, by the description, seems to be meant to be applied to abilities that can normally be improved to a point through training/practice, etc. Thus, in this setting, my interpretation would be that it applies to thinks like casting skill, but not the inherent link you have to a given type of magic, which cannot be trained at all.
Likewise, the limitation on spells is not a hard limit of capability (otherwise, you wouldn't be able to learn from other wizards beyond your inherent numbers), it's just the spells that your link happens to inherently teach you.
Saying Softcap applies to the limit on spells, then, is a stretch in my opinion, because you're not discovering new spells through training, you are practicing and mastering the ones the link provides you. However, I don't think you are going to break the system by applying it here, because it doesn't do anything that learning from other wizards could not.
However, saying that Softcap makes your link inherently more powerful, and thus allows you to access higher tier spells, I think is flat out wrong, and something I would reject as the author. I cannot stop you, of course, if you want to break the system that badly, but that is my word on the matter, anyway.