I'm not querying your judgement about tight design. But I'm not sure about "overly literal readings". For the AC exploits in this thread, it is the literal reading of the rules - as formula substitutions rather than flaggin additional bonuses that can be factored into a default formula - that is being used to shut down the exploits.It strikes me that 5e has a much tighter design than might be seen at first glance. Just about every rules-exploit I've seen relies on a dubious and overly literal reading of the rules.