As much as I loved the content provided by Netflix Marvel, I think they didn't need to go as violent as they did. Except for maybe Punisher. This obsession with rated R content strictly for violence isn't for me. I know others like it...but I want everyone to be able to enjoy Marvel products. That means finding the right balance to make the movies exciting for both adults and children. And the Marvel movies have done a fantastic job with that...and I am sure Daredevil and the Defenders shows can easily do that on a Disney streaming service.
Trying to appeal to everyone pleases no one. The movies are very average unfocused disposable products despite the big numbers and you can't have that for TV shows. You have to get them to come back week after week without the year long hype build up.
So you pick a target, deeply understand who you are making this for and make it just for them. You are focused, not off chasing phantom viewers abandoning your base. If you compromise the integrity of the show the fans will know and they will warn people off; ie Star Trek, Ghostbusters 2016, Star Wars. The fans are the most powerful marketing machine you can have that no amount of money can buy. People outside your target audience will watch if it is good.
If the character is violent, your show has to be violent. The built in range expectations for the stories, look, tone etc must be adhered to unless you are very, very good at translating and transforming the story. See: Nolan Batman, DCAU, Orville; counter example: DC movies, remakes/reboots in general.
The Marvel movies had started out this way. They made it for the fans first and from there organically expanded it's reach. It really really helped that the movies for most part are self contained leaving the audience satisfied instead of sequel/universe baiting.