I think that Quinn was originally known for her dueling ability rather than her roaming, but they strengthened the latter more with the Update.
Graves is actually subclassified as "Marksman/Skirmisher" with the new terms- just relating this to what you said.
I think that both Updates hit the mark for Riot- They wanted to strengthen or build a unique identity for each Marksman or Markswoman, and they did it pretty successfully, IMO, even if it means that, with the new "Marksman with a real Shotgun" fantasy for Graves, he fills a unique role with a unique playstyle within the Marksmen roster but at the same time slightly leaning towards the Fighter/Slayer roles.
Another good example of why such Updates succeeded (at least the idea behind them, but I'm going to argue that the execution did too), is Corki, whose identity of a "Magey" (Artillery) Marksman was pushed even further with his Gameplay Update.
So again, while it did push him more towards the Mage role, he now has a niche, something unique that he can bring to the team- A Marksman with a TON of Magic Damage.
Slightly pushing the Marksmen towards different subclasses is necessary, in my opinion, in order to create a roster of champions whose core is the very basic Auto Attack mechanic, so things will be shaken up this way and allow for new and unique strategic identities for each,
I'm using your examples as my examples too because I think that the Marksman Roster Update did what I'm trying to explain best- Riot took a very "samey" roster of champions and built upon, pushed and strengthened each of the older Marksmen's niches with the purpose of giving them a unique role within a team, even if sometimes it's at the cost of throwing a bit of what most people would say is those champions' old core identities (Like in Quinn's case and her old dueling capabilities).
######Hopefully this was understandable enough and I also want to clarify that I don't intend to argue with you, DikoManel, because as you obviously said, you liked the Updates, so I'm mostly just giving my two cents on the subject. Hopefully I didn't use the words "unique", "identity", or "strengthen" too much, too. :P
