[WorldMaker]

That does seem like bad UX/"DevX" that that configuration of rules is "valid" syntactically and there weren't better equivalents of "linters"/"compilers" flagging that before it ever got sent out as an announcement. UX issues are a "proneness" to error/fragility. It sounds like there is room to build a "higher level language" (like a "Typescript : Javascript :: ? : BGP") for BGP announcements that is less prone to "accidentally bad programs". Not that I have immediate suggestions, just that my gut reaction from skimming these sorts of outage reports is that if it was a "language" I was writing in I can hear that I'd want a lot more (type) safety nets.