There appears to be a rough consensus but it seems to have emerged relatively recently. I learned OCaml about two or three years ago and at the time the best tooling was Tuareg and Merlin in Emacs. Fortunately for me I love Emacs, but I found the Dune documentation poor and overall I got the sense that the OCaml production ecosystem (vs academic) is largely dictated by Jane Street these days, but the community is kind of quiet about the extent to which Core is the "real" standard library and the default stdlib is an academic curiosity. For one thing, the community seemed to be in a transition period between ocamlbuild and Dune, as the official resources recommended ocamlbuild and the community said everyone uses dune.
Yes, this is changing, and these changes have been ongoing since about 2013 when opam was created. But it's true that they're accelerating. I think it's reaching critical mass. so yes a few years ago I would say your points would be valid, but today they are less so.
Good to hear this is changing, though.