I think besides being very generous, one of the things that makes me appreciate Heroes is that all of the regular versions of units(besides Charlotte) can be gotten anytime, even the rarest ones like Saber and Linde. And while you do have Fjorm and Gunnthra, Fjorm is gotten for free on a Chapter and IS does tell you when Gunnthra is coming up, meaning you can save up for her.
Compared to say, Grand Order where there are a ton of Limited units that aren't even alternate versions, the worst offender being Scathach, who was part of promotion materials and whatnot. How would you feel if you were shown all of the characters on the title screen, promotion materials and whatnot back then, IS really advertised these characters and whatnot, and then you learn that a couple of the characters on the title screen could only be gotten whenever they are on a Banner? Not an alternate version of a character, but the regular version of a character? It's disgusting.
Gunnthra could be considered similar, but IS at least tells ahead of time when she comes back, compared to Grand Order which is definitely one of those, "Tells you at the last moment" scenarios when a Limited character is shown to be coming back.
The opposite is somewhat happening with the Alt craze going, with alternate versions of characters starting to appear on the regular rolls. While some of the Alts are nice, it starting to devalue the Choose your Legends Alts and now, CYL3 is very possibly going to be more of, "Which characters do we want who haven't gotten in yet?" rather than a popularity contest compared to the 1st and 2nd ones.
But regardless, I still consider it a good thing that the regular characters in general have always been added to the Summon Pool and that you can potentially get them anytime, compared to say, always being stuck on a Banner. And Legendary Heroes hasn't reached this level yet, besides with Gunnthra, as Fjorm can be gotten for free and the rest are alternate versions of characters. And I hope it stays that way.