Is it just me, or does this seem terrible? Lack of a stable business key & limiting key size to 4.5 digits just seems terribly lacking in any competent database

Is it just me, or does this seem terrible? Lack of a stable business key & limiting key size to 4.5 digits just seems terribly lacking in any competent database practice. I was building ISAM database applications for small business in the early nineties, and we used 6 digit keys.. and an index to access records by. I'm sure Raymond Chen is a nice guy, but this just makes me think of a retard stabbing his cheek when trying to eat with a fork. (Dirty Rotten Scoundrels movie.)