Few people leave Walter Writes over capability — the distribution stack is the broadest in this set. The usual reason is the 300-word trial: it is not enough to judge output before committing to a card.
The second is the unpublished per-request cap. Monthly words are stated clearly; the single-document limit is not, and that is the ceiling long-form writers hit first.
A third, for anyone doing the arithmetic: the plan is priced per month rather than per year, and no annual discount was stated in anything we could retrieve. Several tools in this set cut 40 to 60% for paying yearly, which narrows the gap that $8 a month opens up.
None of that makes Walter Writes a bad tool. It makes it a tool with a shape, and the question is whether that shape matches your work. Our full HumanFlow vs Walter Writes comparison sets its numbers against ours in detail, including where Walter Writes wins.