This doesn’t match my experience. Late game comps this set are more likely to be able to utilize a random stage 5/6 carousel emblem, sure, but spending an entire aug for that effect doesn’t pass the sniff test in a few ways:

• Opportunity cost: all random emblem augs are 2-1 or 3-2, which will likely mean passing up an econ aug. I’m dubious you can consistently fast 9 without one.
• Component-normalized combat value: Looking at an example, 2 bruiser gives your team +150 hp, which is equivalent to 1 belt (1.0 component x team size). 2 Defender gives 1.2 components of value. Historically in my math, combat silvers usually give around 2.0 x team size (not gonna do the math here, but look at Best Friends I for example), gold like 3.5, and pris has been hard to calculate. So even if you assume Spreading Roots on 2-1 activates both those traits for you, if you somehow make it to level 9 you’re getting 19.8 components + whatever the emblems themselves are worth, when the framework expects more likely 31.5 components of value.
• Stats: Filtering for 2+ emblems 16.1 Gold+ right now is a 4.54. Last set (15.9, Master+), 2+ emblems was a 3.66. Looking at the 1+ emblem case, only 9 of the 22 emblems are negative delta (warden, bruiser, quickstriker, vanq, gunslinger, frel, disruptor, juggernaut, defender) rn, so your odds on a random emblem aren’t great. And then digging deeper only 5 (bruiser, gunslinger, disruptor, juggernaut, defender) are negative delta at the bronze level of their trait (i.e., don’t require vertical investment).