I really miss the possibility of configuring dependencies per project in a easy way. OPAM will allow this using OPAM switches, but it is complex and error-prone

I really miss the possibility of configuring dependencies per project in a easy way. OPAM will allow this using OPAM switches, but it is complex and error-prone, while most any other package manager (sbt, leiningen, maven, nimble, cargo, npm...) will do this by default. For some reason, OPAM defaults to installing dependencies globally and does not provide an easy way to support different workflows