kind of a weird question on a complex topic, but in short... kind of.
team building is generally the exercise of combing individuals (or contemplating combining individuals) into a cohensive team unit, especially in the recruiting / recruiting planning part of the game, but also when it comes to practice planning and EE planning.
building a team with a bunch of strong defenders across most or all of the team, with particular players who fill other roles like lead scorer, pg, or rebounder - is generally a good starting point. ath is a component in most of the abilities that the game runs on, like the ability to rebound, or defend, or to take 2pt shots. so, skimping on other ratings and focusing on ath, its a decent starting point from that perspective. its perhaps semantics, but ath doesn't boost other crap ratings, but ath is a component in most of the basketball abilities in the game, so the good ath and crap other ratings can average out to be decent.
good ath alone isn't usually enough to do anything, ath/def primarily drive defense in most cases, good ath with crap def would yield pretty poor defense. ath alone is enough to get to the level of basic competence scoring wise, perhaps not with like 1 lp/per, but it can go a long way with just some crap level of scoring abilities. ath is a decent component in rebounding but rebounding the rating is significantly more important in the rebounding ability, so a team with good ath and garbage reb will still suck on the boards.
i think what you are probably getting is advice geared towards newer coaches, especially in d1, where new coaches tend not to value ath enough. ath is important. a team with high ath and everything else crap is still going to basically be a crap team. the point of team building is to try to get high return on your investment. having 12 95 ath/def players on a d1 team is a complete waste if you lack all the other abilities. you are going to get a much better return on the talent you bring in, if you have some scoring, some rebounding, some bh/pass in your back court, and then about as much defense as you can get (the ability, not the rating) on top of those other things. that said, ath is quite important in today's game and you definitely want a lot of it.