this is my 2 cents

flow is really needed, 1: bad flow makes shit hard to read and make readers get bored of ur shit ez

2: even sayin that, u can't really tell how someones text flow exactly, an example of this is

Eminem and Dmx got waaay different flows, both unique in their way

but do u think they write their shit out the same way? no

and one of my friends who do songs writes wierd, if he posted his shit exactly how he writes it on paper, u'd think he had no flow but he does,
cuz u cant really tell how long certain pauses are and shit, and how fast is the person spittin it,, nah mean?

but it's kinda good to make da flow somewhat obvious fo readers sake

thats my 2cents