Nothing stopping just installing linux on the preassembled one when you get I though, I assume. Although I guess you may have to pay for a Windows license in that case...
I undertand in 99.9% of cases people just want to buy a laptop, turn it on and have it working. But I also think there should be an easy way to opt out of Windows enforced by law so that MS don't bang up numbers due to shady commercial practices.
FWIW, I'd be much more interested in your products as a solid platform for running Linux than whatever junk MS is including in Windows 10 this week anyway. But sometimes small issues can say a disproportionate amount about where a business really stands on some issues I care about, and things like having control over my own hardware and software for reasons ranging from longevity to privacy are high on my personal list.