I'm strongly in favor of detailed character sheets. I got my start RPing in Facebook Harry Potter RP groups, where all we really had was a picture, a name, house, brief bio, and a blood status. It was super rough and quick and it worked well there, since it was essentially one liners all the time and none of the plots actually connected together or lasted very long (I remember at one point, one of my characters was aged 10 years and had kids of his own, and at the same time, their friend they went to school with was still a 4th year.... But that's not really relevant to this lol). 

But now that I'm older, I really crave really intricate and long lasting stories. I think that fleshed out CS's are really conducive for this. Even something as seemingly trivial as height has come up time and time again in RPs I've been in - such as a realization that one of my babies, Guin, is almost a foot shorter than her boyfriend. And for scars and tattoos, those can really tell a story all of their own. I have one character, Arya, whose scar has a lot of importance to her backstory - it really relates how she grew up. 

But as messy and disorganized at this response is - I think the CS matches the RP. If you want something intense and well plotted out, then an in depth CS is a must. If you're just kicking around ideas in a sandbox and you aren't that invested in having things be rigorous or that it'll still be that same story in a month or so, then sure, go without a CS. I've had a lot of fun doing RP styles like that with friends just by text message for example. 

As long as you're happy and you're having fun, do whatever works for you. What I enjoy won't always be what someone else enjoys.