There are going to be artists who separate accounts for wips, finished work or original content, fanart, non comic stuff, doodles, even NSFW work and so on.
Personally speaking I don't see the appeal to have different accounts for specific kinds of content, for as long as it's not something that goes against a site's guidelines that you clearly can't post or have to make a post redirecting to a site with the actual artwork.
As well, having separate accounts can actually lead to having less people seeing all the things you do, because even if you have in your description that you have a main/secondary account, most of people won't bother checking it out, the more steps a viewer has to do the less will see, because they rather scroll instead of taking the time (And that's why most of the time, the same person won't follow you on all your accounts)
Do what YOU consider more appealing, do what YOU consider more comfortable.
Sorry for the caps, but besides if you feel admiration for that artist, or any other one in particular, just because they do things a specific way doesn't mean you have to copy or follow their example 100% nor means that what they do is a must or is extreeeemely necessary, it's all about how you feel, how you want to present your work, what kind of content do you want to offer, and how accessible you want it to be for your viewers.