Neither do Atletico.
Be honest, how many games of theirs do you watch?
Atletico don't sit back so often or so deep, but they have struggled to play expansive football against the bottom 17 teams in La Liga. They've only scored 54 this year in the league. Incredibly, they've only conceded 16 goals in 32 matches so are still in the title race, and they'd have probably at least 5 more if Jackson Martinez hadn't been a complete bust as a 9, but they are often quite boring and unimaginative to watch when they have the bulk of possession.
I thought they'd sort of transition to having 2 teams this year with the normal 4-4-2 thing but then in easier games, more 4-3-3, with Koke and even Oliver playing centrally and Griezmann playing wide to give the kind of goalscoring threat from the flanks that Barca and Real get from Neymar and Bale (not going to score 40 from out wide like Messi and Ronaldo, it's basically impossible).
They should still probably look to improve their attack against the bottom 17, though, as it's sort of unrealistic to expect to concede like 13-14 goals (assuming they concede about 5 in 4 against Real and Barca) in 34 games against La Liga teams, though of course they've done it so it is possible.
But they've gone from 77 goals scored in their title win, to 67 last year and probably will get around the same number this year (easy last 6 games and draws are useless at this point, so 13 in 6 seems plausible). I bet they'll look to upgrade in attack this summer, either with a physical striker to replace Jackson or a winger if they trust Correa to form a partnership with Griezmann. Also, they don't really need to add players anywhere else except maybe a new backup fullback.