Everything after "not made by Marvel studios" is just a factually incorrect description of how these shows were presented and sold in the early/mid 2010s.

It was officially "canon to the MCU." Remember, even the Netflix shows sold themselves as being part of the marvel cinematic universe. The canonical answer to the question "how did Nick Fury get a helicarrier in Age of Ultron" is literally "go watch Agents of Shield." This was a core part of the initial selling point of those series.

There are reasons to believe that Disney will in practice treat Disney+ shows as "more canonically important" than they treated AoS but officially, Disney never embraced the (obvious) truth that the tv shows weren't really canonical and they were in no way going to impact the movies.

what happens in these shows

It's actually really hard to coordinate long running tv shows and an ongoing film franchise. It's fairly easy to coordinate short season "one-off" tv events with films already in pre-production but you'll soon run into problems if you move beyond that narrow formula.