The point was that before Bayern's current dominance, the Bundesliga wasn't any more one-sided than, say, the Premier League in its first 20 years. Manchester United won 13 out of the first 20 PL seasons - do you consider the first 20 years of the Premier League "uncompetitive"? It was, even then, marketed as the most exciting league in the world yet it was actually less competitive than any of the big ones.
Bayern were always the biggest, most successful club of the Bundesliga, that's true. But the league itself used to be a lot more competitive than it is now. Even as recently as the decade between 2000-2010 saw the likes of Dortmund, Stuttgart, Werder Bremen, and Wolfsburg all win league titles while both Schalke and Leverkusen came incredibly close (as in, "they bottled it on the final day" close). Hell, in 1998, a fecking newly promoted team won the league!
Pretending that it was always Bayern dominating without any competition is dishonest in the extreme.