"#OpenBSD attempts to minimize the need for customization and tweaking. For the vast majority of users, OpenBSD just works on their hardware for their application."
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Given Chromium manages to run on other systems presumably this can work. Do the memory limits still serve a good purpose? (I’m asking thorough curiosity, not criticism)
I'm not aware of all the particulars, but certainly enforcing a limit is a good thing to prevent any one process or user from exhausting system resources. On other systems, this seems to be a growing problem, not handling malloc(3) failure, ignoring fd exhaustion (ENFILE/EMFILE).
It's worth nothing, many "other" systems deploy an OOM-killer (Out of memory) that sacrifices other processes. OpenBSD does not, and relies on applications to handle these conditions themselves (e.g free up resources, sleep, die gracefully). But instead, many just crash.. 
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