This is actually partly something I did want to bring up when I had time to actually edit it. As of right now my intention is still to add YFNSM. However Disney+ is treating it like Team Thor and X-Men '97 and not placing it on the timeline despite being part of the franchise. I just wanted to give an opportunity for anyone who is maybe having second thoughts on it being included here especially since the nature of the series changed since its original announcement as part of the MCU. Just wanted to open that to the floor
On why they aren't added for Team Thor it's because they're comedic shorts intended as bonus features and not necessarily part of the MCU like the other one-shots. However if the majority of users would like this changed then it's something I'd be willing to add.
For X-Men '97 while Disney+ does include it in the Multiverse Saga to my knowledge nothing else from Marvel has acknowledged the series as part of the MCU franchise and even then the show itself has nothing to do with the MCU outside of sharing a Multiverse and Marvel Studios so it would make little sense including it without including the other various animated shows and quite frankly even if the majority of users wanted to add X-Men '97 I ain't taking the time to add the other various 90s cartoons to the timeline.
Personally I myself watch it with the Multiverse Saga, not because I see it as part of the MCU narrative but because it's just awesome, more of an honorary inclusion.