No, really though, there’s one line that really sticks out to me as not getting near enough attention when talking about Tyrell dynamics (actually, Tyrell dynamics as a whole don’t get enough attention. Tyrells don’t get enough attention. What do you mean I need to widen my focus).
The line in question is from the scene where Margaery and Olenna are revealing the existence of the Tyrell Marriage Bureau to Sansa, and introducing her to the idea of Willas:
You will love him as much as we do, Sansa.
Now, let’s take this as a chance to do my second-favourite fandom thing: comparing the Tyrells to the Lannisters and showing off how my bbs come out on top in most regards.
House Tyrell is set up within the books as an anti-House Lannister, of sorts (I have put a lot of thought into this, I promise). There are plenty of parallels I could go into here - the beautiful daughter, set up to be queen. The wife, born to the wealthiest House of the region (aw yeah I see y’all forgettin’ the Hightowers). The favourite son a gifted warrior, beautiful and arrogant, raised to the Kingsguard at an unusually young age for largely political reasons. The physically disabled but noted intellectual heir. A case could even be made for Mace’s blind ambition vs. Tywin’s dedication to legacy above those who will produce his legacy, ie his kids.
The anti-Lannister bit is where the above line comes into play - the Lannisters have probably the worst, least healthy, least loving in-House dynamics of any House of which we get a POV character (including the Tullys, because we have Cat, and yes, the Greyjoys too, because Asha at least has functioning relationships with several family members). Cersei, for example, loathes Tyrion, hates and idolises Tywin, and let’s not even try to quantify what she feels for Jaime.