Characters grow greatly as time goes on, adapting to better suit the culture that they grow up in. Vampires were originally basically just zombies until authors like Sheridan Le Fanu and Bram Stoker started alter them to be more "sexy" and cunning. Werewolves, as we know them, (transformation with a full moon, silver being used as a means to kill them and appearing as a mix between man and wolf) is a complete Hollywood creation as most older werewolf stories have NOTHING in common with any of these tropes. Hell, in many "werewolf" stories the Beasts in question are actually rather civil and sentient as their just humans who became wolves by putting on wolf skins. Yes, Really.
I bring this up to address the impact She-Ra and the Princesses of Power might end up having on the He-Man franchise in the years, if not decades, to come. And the single biggest alteration from the Original She-Ra series is, of course, the relationship between Catra and Adora.
Much like Catwoman Catra in the 80's series is VERY different from the character she started as. Originally a human who could turn into a cat, was just Adora's rival, both in combat and for Sea Hawk's Romantic affections in the 2018's series Catra is a Catgirl, who is Adora's best friend turned rival and is also Adora's romantic interest. In the 80's series, from what I can remember, Catra and Adora didn't really have much, if any, connection to one another besides both being part of the Evil Horde and both having an interest in Sea Hawk and there's nothing else really that complex or deep about their relationship.
By contrast, Catra and Adora's relationship is actually the emotional core of the 10's series with both clearly being in love with one another and yet being forced to fight due to their own personal hangups, (Catra suffers from a REALLLY Bad case of inferiority complex and Adora has a Equally bad martyr complex). Their relationship at the start of the series, while having it's positive elements, is clearly very toxic and unhealthily and both need to do some MAJOR Development over the course of the series in order to become better people who could have a Healthy relationship with one another.
And, I'm going to be honest, that's a LOT more engaging then their original dynamic and I'm honestly curious as to what effect this will have on the She-Ra/He-Man series down the line, especially given how well received the series ended up being. I honestly wouldn't be surprised if future adaptations of She-Ra decided to give Catra and Adora a similar relationship and arc, going from friends, to enemies then back to friends and finally to lovers and just pared Bow with Glimmer and Sea Hawk with Mermista.
Again, going over to Catwoman, when you say Catwoman you know her character from the ground up even if you've never seen ANYTHING Batman related but you likely know little to nothing about who she was at the start of all this. I think the same thing will happen with Catra, that years from now she will always be presented as a villain turned hero who is She-Ra's/Adora's childhood friend and main love interest.
The series is already engraved itself into popular conscious to the point that if you say She-Ra most people will go "Oh, yeah, isn't that the show with girl that transforms into a superhero and has a girlfriend who's a catgirl?"
It helps that the show itself is actually REALLY Good with a great plot, fantastic characters and fun action and world building. And top all that off with one of the Best Romances I've Ever Seen and you got a series that will likely leave it's mark not only on the Masters of the Universe franchise but on pop culture for years to come. Thoughts?
