There are very good reasons to use two or more transducers.Dynamic transducers are cheap and lightweight. Unfortunately when you use one driver, then it needs displacement to play bass and phase accuracy to play highs. The former requires big size, the latter small size, or you'll get destructive modes all over FR.

So far we arrived at a consensus that 40mm driver is the golden compromise, however the bass will roll off and it doesn't look good in the marketing material. That's why 50mm driver are being marketed towards the "casual consumers". They have more displacement, but are bad at everything else and really only work with waveguides.

So you want to split the signal. The problem is that you need to find the actual drivers. Not only that, once you find the drivers of the right size, they need to make some quality noise. This is difficult, but it doesn't end there. The high quality drivers need to be mass manufactured or else the headphone will cost a fortune. So you end up using whatever basket of sketchy parts you can collect. In this case it seems like they found some Chinese earbud speakers, which probably were too small to cross them to the big boys, so they had to use two of them. Two drivers have more output and if they're small enough, they play like one driver. I probably sound very critical here, but this is actually how you design good audio.

The big boys still play quite high IMO, but what do I know. Optimally you want the bass to be completely separated from the rest but, as above, it's not always viable.

With drivers as small as theirs, they probably realised that they can reorient them so they're playing with the idea of HRTFing the driver's response. The important part is that they are as close to your ear canal as possible.

When you use multiple drivers of the same kind, the costs go down. Sometimes that's the difference maker. There's this company that makes loudspeakers out of tweeters. They can undercut other manufacturers and that's why they're popular.

In the past a headphone like this was not a viable option. Today we're getting to the point, when energy efficient and highly integrated chips can handle devices like these. The goal right is to find that secret sauce.