Also.........Boston Brewing is still owned and operated in the USA.......much of their beer is produced in Cincinatti, and the remainder is brewed under contract by various breweries.
In my opinion, the term "mass production" when applied to beer really just means large batches......which lends consistency to the beer and also requires more exacting quality assurance. A "craft brewer" can get away with inconsistencies between batches, and indeed this represents a lapse in control of the process; whereas a large brewer can not. So in many ways, it is more difficult to produce a lot of beer.....batch after batch than it is to produce small batch craft brews. Of course, having the same beer taste a little different between batches is appealing in a wine-snob sort of way.
But anyway, Sam Adams offers a consistent product bottle to bottle, year to year. You always know what you're going to get when you crack a Sam Adams.