>The articles and papers from the vendor, MVPs, "gurus" and wannabe-experts that you describe, are just lots of anecdote at this point. the plural of "anedcote" is not "data". It is as if a surgeon writes a description of a new treatment that he/she wants other surgeons to try. Even the best surgeon in the world would be expected to support their stance with a valid trial showing a better/more cost-effective outcome or they would not be regarded as a good surgeon for very long.

I am sorry, but we are part of anecdote writers and readers. May be for a few years we learn how to read them. We produce more than 50 systems for year and have possibility to test in real world most of them and if there are any need to improve them.

>In the absence of proper evidence, it takes extended customer and developer experience after release to arrive at the facts. For example dotNET has performance issues on some hardware; this has been denied emphatically by gurus and MVPs but the groundswell of evidence is now very clear. Then we have people like you saying it takes 4X as long to write a C/S app in dotNET. Again we have gurus and MVPs denying this emphatically and articles describing time-savings writing C/S apps in dotNET based on a single vaguely defined case that may be irrelevant to most readers. Do you see my point?
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Everybody have rights to claim what he likes. Only tests with Chronometer and payroll could prove some or other think. There is other issue. Creating of a system of C# guru in C# will take the same time if he try to make it in VFP, because he is not proficient in this language. In this case they are correct. The other will be responce when the same system is created in Gurus in thier field of expertise.