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As far as I remember they last did that when the OBSD 5.x branch was launched. Since then it's been stable.

Or atleast my rule-setd are simplistic enough that I haven't noticed.

There are some minor tweaks to what port range syntax is acceptable: https://www.openbsd.org/faq/upgrade69.html

Has anyone ever tried to propose a "universal" firewall syntax. Like an "intermediate representation" that can then be translated into the syntax for any version of any firewall software. Obviously it would not work as a 1:1 translation for every rule. There are things that one program can do that another cannot. Even something pre-pf like ipf still has some yet-to-be duplicated functionality. However there are many commonalities between all these programs.