Reasons not to use an auto-incrementing number for a primary key

Question

I\'m currently working on someone else\'s database where the primary keys are generated via a lookup table which contains a list of table names and the last primary key used

Answer 1

My main issue with auto-incrementing keys is that they lack any meaning.

For tables where certain fields provide uniqueness (whether alone or in combination with another), I'd opt for using that instead.