There's a huge fundamental difference in these two statements.
1. "ENT did good, but had diminishing returns.": ENT did good on the worst network on TV at the time. It only survived for four seasons because it was the highest-rated show on the lowest-rated network. And the network that produced it hated it, because it was a very expensive show to produce while only getting minimal returns on its investment. The only reason why it even got a fourth season was so that UPN could sell the show to syndication. And its cancellation marked the death of Star Trek on TV until JJ Abrams's films proved that Trek was still a viable investment.
2. "DIS did good, but had diminishing returns.": DIS was the flagship show for a streaming service that doesn't rely on ratings, that now produces five Star Trek shows because of the popularity of that flagship show, and is still producing that flagship show after five years, whether the same amount of people from five years ago are watching it or not. Not to mention that all of these shows, DIS included, survived the COVID pandemic and were still being produced.