No, I think thats an unfair characterisation. The argument is not that they weren't 21st century enough in their ambitions and innovation. That would be historicism. I wouldn't expect them to think like us or have our culture.
The point is that the roman empire was perhaps much more technologically and culturally sterile than we have given it credit for. It was a force for technological stagnancy rather than invention, and if it hadn't fallen we'd have been stuck at much the same level. They had nearly 1000 years and didn't really change a great deal.
The political system did not create conditions for technological growth, except in very limited areas. Where were the great roman writers and thinkers even? Had they been more innovative they might have found solutions for the Hunnic invasions and the Teutonic tribes that they had to face.
I see it as a great big military and administrative machine. But not one that seemed to grow and adapt a great deal during its history.
I agree by and large.
I'd say the fatal flaw of Rome was its relative lack of social mobility. Progress comes from people trying to make things better. Technology is developed by someone wanting to make money and fix a problem.
That didn't happen much in Rome, as there were two kinds of peopls... rich patricians who had no motivation for doing so, and poor plebes who had no ability to be rewarded for it, and lacked education to do it anyway.
Not to mention the fact that the conquests and wars of Rome produced a massive quantity of cheap slaves, to the point where even the relatively modest man could own one or more, really did not put labor saving devices at a premium, as they weren't doing the labor anyway.
You can make the argument that much of the techonolgical innovation in the West arose from the bulbonic plague. There weren't enough people left to work the fields, so better methods had to be devided. Necessity being the mother of invention and all.