I agree with that statement, however it makes no sense to me as to why they would plan to use the 810 if it is a fall release when other companies (LG) are planning to use the 820 in their fall devices. They had to have seen it coming. I think Windows 10 Mobile will maintain the title of "most efficient OS on the market", however people have had issues with 810 phones in a number of basic tasks such as filming (camera is a HUGE part of Microsoft phones).
I agree that people don't want to keep waiting, but this is do or die time for Microsoft. As much as us loyal fans want to stand by this with all our strength, they need to gain market share and if the phones have big issues, which turns off the general public, then Microsoft is in for a long ride. If it meant an extra month then, at this point, I don't think it is hurting anything to get it 100% right.