In broad strokes, there have been many successful stories in which Aunt May knows Peter's secret identity so it is not a prerequisite for conflict to be present. It's not strange for long-term readers to recall those stories and prefer the character dynamics to today's retread of the same old tired beats.
And in broad strokes, unless you are Charles Xavier or another telepath using a sockpuppet, mindreading fans and ascribing motivations to them is...not really fair play. It's projection.
And in broad strokes, Marvel is owned by Disney and Disney's business model is to make money by monetizing their content, whatever form that may take. Considering the first MCU Spider-Man trilogy was not centered on "oh noes my loved ones cannot know my secret identity" and in fact showed Aunt May and MJ learning on their own while Peter told Ned, and considering the emotional arc for the next MCU Spider-Man films will probably be MJ and perhaps Ned re-learning Spider-Man's identity, Disney apparently has no problems with stories in which the people closest to Peter know his ID. The films had plenty of conflict outside of Peter trying to hide from Aunt May and in fact did away with that at the end of the first film.
(In fact, all the Spider-Man films featured Peter's love interests learning his ID - and still conflict ensued.)
(And in fact, MCU heroes - the version of the characters most familiar to a wide audience - are not that concerned with keeping secrets, with Tony Stark revealing his identity at the end of the first Iron Man film. T'Challa revealed the existence of Wakanda. Natasha testified to the Senate. Scott Lang's ID was known. Steve Rogers's ID was known. Rhodey's ID is known. Doctor Strange revealed all to Christine. Thor never did assume the Donald Blake identity. Carol told Maria and Monica. Sam's identity is known. The only story that hinged on keeping an identity hidden was the series Hawkeye, and that wasn't about keeping the world from learning Clint Barton was Hawkeye - it was about keeping the world from learning Hawkeye was the not-so-nice Ronin, while also protecting Laura's secret because she was no longer in the game. Today's audience, who probably had their first experience with Marvel be a film/TV series and not a comic book, is not expecting secret identities as a key story element).
When you say Marvel, I believe you really mean certain editors. They're not going to be sitting in the chairs forever. No one knows what the future will bring, especially as media continues to evolve and the ways people consume stories evolves with it.
Anyway, this conversation has now gone around at least two entire revolutions so I'm stepping off the merry go round. Feel free to have the last word.