Earlier quoted context omitted.
I think parent's point is about how the company is drawing in cashflow. If the customer owns perpetually a copy of the software, the only reason they'll buy a new copy is if the new one is substantially better than the old: hence, the only way the company makes cash next year is if they've been improving their product. With the subscription model, the company is still going to make that income regardless if they have…
I have a different view. Perhaps because I used to publish my own shareware. Today's current Patreon model is pretty close to how shareware used to work (for me). Buying a license today is investing in future development. I wouldn't pay to use software that's not actively being maintained. Nor would I expect my customers to either.
What is discussed here is the case where you lose the right to use the software if you don't continue to pay, completely independently from what that money is used for, which is why it removes one important incentive to improve the software.
And if your skillset and your data is locked up in some software, it's questionable whether you really would stop paying, and thus stop using the software that you depend on.