I think it is a pretty clear line between attributing the quality of a piece of software to two decades of prior development at the same company, with its own continuity of developers and institutional knowledge, as opposed to the general benefits all software gains from the industry advances it builds upon.
No it's not a clear line at all. In fact Lotus 1-2-3 was literally the direct predecessor from IBM in terms of everything but the brand name and some design choices.
I think it is a pretty clear line between attributing the quality of a piece of software to two decades of prior development at the same company, with its own continuity of developers and institutional knowledge, as opposed to the general benefits all software gains from the industry advances it builds upon.