You DO know the examples you gave are 25-50 years ago...where fans weren't as vocal or cared as much about continuity or diversity.Um, this kind of thing happens all the time. The original STAR TREK, for instance, routinely used the same guest-actors over and over, playing different characters, as did the later shows. See Mark Lenard, William Campbell, Diana Muldaur, Morgan Woodward, Majel Barrett, Suzy Plakson, James Cromwell, etc.
It's not "cheating." It's theater, show-biz, acting. A certain willing suspension of disbelief comes with the territory.
I wouldn't have called it cheating as much as lazy. Now, if the actor can portray a truly different character, and that would be due to make-up and accents/voice (like Suzy Plakson did, or Tatiania Maslany or Chadwick Boseman can do today), most people wouldn't mind. SOme of the other examples others gave also had a major change due to make up, so they clearly seem different.
If they look and sound like a character they just played...COULD be a problem (at least a major annoyance).
I didn't get a good look at the AoS character, so, so far that doesn't bother me.
And back to Daisy....if she DOES become director...i hope we see it in a coda.. like 5 years later or something. ...maybe an office with paintings of Coulson and Carter and Fury in the background.
They also need to have a new tech geek that outshines Daisy's skills, but perhaps still gets humbled by her.