the Jester
Legend
One of the problems with random monster tables was derailment; an unexpected encounter usually has unforeseen, negative consequences - draining party supplies and resources for no (or little) foreseeable gain and therefore making the stock encounters more difficult.
IMHO this is a feature of random encounters, not a bug- and certainly not a "problem". The whole point of random encounters is that they are a derailment (apt choice of phrase- my group doesn't want to ride on a train anyhow) and a drain on the part.