Yeah, you said it was FAR lower performance, I'm curious how you know that without benchmarks.
It's a guesstimation based on how the CPU on this is the bottom of the barrel 8th gen and how the one on the nTB wasn't in the 2017 line.
But anyway let's talk numbers (and I may stand corrected on this one):
CPU performance:
nTB MBP has the i5-7360U with Intel Iris Pro 640. It's a standard Intel SKU, 15W TDP.
On Geekbench the upper portion of scores for the nTB MBP 2017 hovers around 4500 single core/9500 multi-core.
There isn't an SKU on Intel's website for a dual-core i5 with 1.6 GHz. Much less one with the Intel UHD 617. Go figure, this may be custom-made for Apple.
The closest one is the Core i5-8200Y - that's a 1.3 base/3.9 Turbo Boost chip with 2 cores and the UHD 615. I don't doubt that what Apple has done here was just play around with the clock speeds for that SKU.
Anyway: the only device on Geekbench using that processor is the Google Nocturne (an unreleased tablet! Again, go figure). I know, it's a tablet, but peak performance should be the same. That scores 3900 single-core / 8164 multi-core.
That's a 15% difference. I know Apple's chip will be different - but keep in mind Apple's won't Turbo Boost as high, so peak performance should be the in the same ballpark (maybe a bit lower than the Nocturne?). And I imagine that thing will get heat soaked more quickly than the MBP, and sustained performance won't be anywhere close.
As for the GPU, I think we can agree the one on the MBP should be far better, right?