I come down on the side of the OP (sometimes I get frustrated waiting years for new chapters), but I'm also surprised by writers who are able to publish work that they haven't finished yet. I understand the idea of teasing readers by publishing in installments, but I couldn't possibly publish something when I didn't know where it was going.

A big reason for this is that my stories often change shape radically over their writing, and I need to go back to earlier chapters to fill in more details, or change characterisations, so that the later chapters make sense.