Where I think it can break (and we show some of that in the benchmark post, though not on EigenPal specifically) is on tricky document edits, like multi-turn track changes, implicit style understanding (respecting surrounding styles without being told to), advanced list manipulation, etc. We also saw these problems get amplified on long-horizon, challenging document workloads.
Eventually we realized no product out there truly handles the wide variety of cases agents run into, so we set out to build one.
So to answer your question, it depends. If your documents are simple and you're happy with the results, stick with what works. But if you have tricky documents and find yourself chasing the N-th edge case, I think delegating that to something like our product makes sense.