Runaways didn't ignore the snap, it accidentally passed it. You can't blame a show for not following the timeline when there isn't a clear indication of it. The props are half assed, though, I'll give you that. Agent Carter shows a clip from the One Shot in the first episode. They're clearly intertwined.
Avengers: Endgame featured Edwin Jarvis from Agent Carter, therefore that show is 100% canon. Not just the character, but the same actor. The end of Season 1 features Arnim Zola, and the Hydra theme from Agents of S.H.I.E.L.D. plays. The Dark Force that was introduced on Agents of S.H.I.E.L.D. made an appearance on Agent Carter. It became the source of Cloaks powers on Cloak & Dagger.
Agents of S.H.I.E.L.D. features Nitramene from Agent Carter. Agents of S.H.I.E.L.D. features a reference to the events of Daredevil, specifically a gang war, on a TV. It also features a Judas Bullet from Luke Cage, believe it or not. Micro from The Punisher helps out Coulson's S.H.I.E.L.D. in Season 2. The Dogs of Hell biker gang appeared in Agents of S.H.I.E.L.D., Daredevil and The Punisher. WHiH Newsfront references the ATCU from Agents of S.H.I.E.L.D. and direct events related to them.
Metro-General Hospital, which was introduced on Daredevil and used in other series, made an appearance in Doctor Strange and was mentioned in Avengers: Endgame, although it was a separate facility.
Inhumans references the Terragen in the water supply from the end of Agents of S.H.I.E.L.D. Season 2.
Runaways features a news reporter from Agents of S.H.I.E.L.D. and an obituary for an agent from the pilot episode. In season 3 of the show, it directly crosses over with Cloak & Dagger.
Cloak & Dagger references both the movies and the Netflix shows, as in one episode "keeping up with the Jones" becomes "keeping up with the Starks and the Rands" and O'Reilly was friends with Misty Night from Luke Cage. She also knew Ben Urich from Daredevil, as evidenced on season 2. Luke Cage was referenced.
The Netflix characters were considered for Avengers: Infinity War.
Black Panther and Luke Cage were both going to have Tilda Johnson/Deadly Nightshade, but once Marvel knew Luke Cage was going to use the character, Marvel Studios changed the name of the Black Panther version of the Character to Linda. Kevin Feige confirmed that Tina Minoru in Doctor Strange was just an Easter Egg, as not to conflict with Runaways, thus claiming that Runaways is canon. Captain Marvel uses the same quinjet set from Agents of S.H.I.E.L.D..
Kevin Feige has stated Netflix as existing in the Marvel Cinematic Universe.
Marvel Studios to TV (in no particular order):
Maria Hill
Phil Coulson
Nick Fury
Jasper Sitwell
Lady Sif
Felix Blake
Matthew Ellis
Gideon Malick
Peggy Carter
Howard Stark
Edwin Jarvis (tie-in comic)
Anton Vanko (younger actor)
Tina Minoru (different actress)
Pat Kiernan (as himself)
Watcher Informant
TV to Marvel Studios:
Marcus Daniels/Blackout
Edwin Jarvis
Have I mentioned the Daredevil rumours and hints?
Rumor has said that Daredevil is now available.…
marvelcinematicuniverse.fandom.com
I also wouldn't worry about Charle Cox saying he's not in Spider-Man 3. Firstly, actors asked that are supposed to lie, and secondly, he said he had not heard the rumours. There's almost no way he hasn't heard them.
And if he's not in it, oh well, he's still the greatest Marvel Cinematic Universe character.
I understand your reasoning, but it's clear that all shows are intended to share a continuity. The films are clearly intending to share continuity with Agent Carter. Agents of S.H.I.E.L.D. S7 is now a partial sequel to Agent Carter. Agents of S.H.I.E.L.D. S7 is almost certainly going to explain the lack of Infinity War consequences.