I'm not suggesting I agree with it, but it's something some could consider. There's no cut and dry way to put everything together without ignoring things all over the place, and that is part of the reason why some people out there don't consider the shows canon with the films. I'm not speaking from what Feige did or didn't say, simply saying that regardless of that, there are some that will never consider parts of the MCU canon. But things can get complicated if and when the MCU starts addressing things that aren't in their canon or continuity, such as the long rumored live action spider-verse, or deadpool, etc. Does Deapool 3 being in the MCU negate 1 and 2 from being in it because they are from the Fox X-Men films? Or does 3's inclusion make 1 and 2 canon as well and the Fox connections are simply jokes?
Feige is making a very specific decision to interlink the new d+ shows with the films. He even called out that it is the first time they interlink. Depending on how you look at that quote, Jarvis in Endgame is not Jarvis in AC. That's why 'canonicity' and 'continuity' are not the same thing. Another way to look at this is Force Healing in SW9, gee that could have been super useful in all 8 preceding episodes. It's hard to justify its inclusion in continuity regardless of its canonicity. So by allowing different continuities to exist in canon you can start to justify or even forgive the aforementioned things you ignored to make it all work.
At the end of the day, I have a full MCU guide of my own that includes everything, but I'm not unsympathetic to those who refuse the shows or have problems with them and don't include them. Everyone enjoys the films, which is the building blocks of the expanded universe, but it isn't that cut and dry due to so many circumstances over the years.