I really think the way the ubiquitous "Internet" discusses Miles/Spidey is both disingenuous and patronizing.
The following is a dramatic reading of "fixxxer vs. The Internet". Resemblance to any Internet or any fixxxer, living or dead, is unintended and purely coincidental.
"I hear there's a black Spider-Man in the comics. Let's do this!"
Ok. Let's start here... there's this thing called Ultimate comics... think of it like an alternate dimension where we see familiar characters from the main Marvel universe, but themes, storylines and the like are distorted, sometimes in interesting ways, but sometimes, in ways that don't work well. And in this universe...
"BLEEP that! I zoned out when you started throwing around words like "comics" and "dimensions" and "interesting" and stuff. Black Spider-Man! Someone call Donald Glover!
That was a little rude, but it's fine. Now, in this Ultimate universe Peter Parker dies... and this 13 year old African American/Latino boy dons the Spider-Man costume. In this take, Peter Parker himself dies and semi-tangentially plays a Uncle Ben role.
"Glover! Glover! Glover!"
But Glover's a grown man.
"I'm bored of Peter Parker."
Look, I know we've gotten a lot of Peter Parker over the years, but trust me, Morales doesn't work without Peter Parker. The MCU isn't going anywhere. I'd rather wait a decade and we might even get Miles-Spidey in the MCU... this would work really well, but requires patience, planning and a love of longform storytelling that is the MCU's forte.
"Racist whitey!"
I'm neither!
"Ok, I just went back and read your rationale. I think I'm willing to concede your larger point. However, BLACK PETER PARKER THEN!!!!"
I BLEEPing give up.