Unfortunately most customers don't want to wait that long. Just look at all those "idiots" wanting to use wireless ac even though it's not even finalised yet...
If a company is selling draft-AC products, mightn't you be someone who wants to use draft-AC features/speeds in the current mode that they are advertised/sold in?
To me, quality control means multiple things:
-Design of hardware/software should meet vendor-advertised functionality and specifications in a stable manner at time of release. Any known serious issues (we all can appreciate that unknowns happen) should be dealt with by this point in time.
-Build quality of hardware must be consistently good on units coming off the production line (e.g., a maximum acceptable defect rate)
-Functionality must meet all industry-standard or agency-regulated minimums at time of device sale
If you advertise a router as draft-AC, as long as someone is using network cards that meet the draft standard you sold, they should work. In this case, I would primarily expect that anyone who buys an ASUS draft-AC wireless card should get the performance benefits if used with an ASUS draft-AC router. Beyond that, anything else is a bonus.
As for other quality controls, I think my RT-AC66R has been made well hardware-wise. While in many cases it performs well, I believe the software is not yet up to the standards I'd like to see; there are some sporadic 2.4GHz wireless issues I'm seeing, and on a different front, there are features that I believe were not fully thought out (e.g., requiring AiCloud use port 443 and not making it changeable -what were they thinking?; choice to limit the UPnP port range) that I would call poor design choices for a $200 enthusiast-level product.
I haven't experienced the frustration that at least a few people here have, and I've found workarounds for several annoying issues, but I do believe that ASUS' top-end routers need further firmware work to make them the product they should be, and that some changes need to be made with enthusiasts in mind (to me, it's pretty clear that if you spend $150-200USD on a router, you're selling an enthusiast-level product and those expectations need to be met, else you'd be spending half the money).
P.S. -as for waiting, I'm a patient person, but if the rumors are true that ASUS already has a successor to the RT-AC66U/R in progress, I'd be concerned that it might force the top-end product I own (which has been top-end for maybe six months) to take a back seat to the new one for development and fixes. We've all seen that happen in the tech industry, and it's a concern that will only be proven valid or invalid with time.
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