I know there's already a thread on the new Canyon Speedmax Disc but I wanted to direct the conversation to a specific topic: Between the Aerobars hydration, and specifically its absence, on the newly announced tri bike.

Until now, BTA (between the aerobars) hydration systems were sold as something that not only improved hydration but also carried real wattage gains and are something that top of the range triathlon bikes have had for years, whether they came with the bike or were added with retrofitting of aftermarket products.

Triathlon bikes sold with integrated BTA systems include the previous Canyon Speedmax, Scott Plasma, Giant Trinity Advanced, and more.
Even the new Scott Plasma 6 has kept an integrated BTA solution despite also having a "fuel cell".

Now, Canyon has decided to go a different way.

The new Canyon Speedmax Disc claims a 9W improvement over the Speedmax CF SLX. While the Speedmax CF SLX (rim brakes) has an integrated BTA solution, the new Disc versions (CFR and CF SLX variation) cannot support a BTA solution at all and only allows the use of the integrated "fuel cell".

I'm curious then why is that so? Why did Canyon decide to create something that cannot use such a common solution?
Were the speed gains not that big after all?

I'm looking to hear people's thoughts on the above.