Although An Ankou's point is well taken. I believe the customary thinking is that the flavour contributions of grains, various hops and the yeast used (even so-called "neutral" strains do add flavour), none are so strong as to mask the others. Many low-flavour beers such as Pure Blonde or somewhat more flavourful ones such as Furphy are balanced.
But adults can balance on a seesaw as well as flyweight kiddies. Brewers of English bitters,, German k.olsches and Helles lagers often seek balance, and succeed. On the other hand, in NEIPAS and Imperial anythings, balance is not on the agenda.
Personal tastes affect the perception of balance. Good Czech pilsners have subtle grain and yeast flavours, as well as a contribution of Saaz flavour and aroma, but to some tasters the bittering dominates.