I disagree. For one thing, the two rotations and the two situations are completely different.
The concern in 2019 was how badly Sale tailed off in 2018. He was a workhorse April thru July, but did not pitch more than 5 innings in a game for the rest of the season and postseason. A year after his truncated 2019 spring training, he needed tommy john surgery, so my guess is that they were already concerned in late 2018 and early 2019.
ERod, on the other hand, had not pitched much in 2018, so he got a normal spring training, which worked. And Porcello only pitched 3 fewer innings than ERod in ST and simply stunk in 2019, which he was always fully capable of doing.
Price threw the fewest ST innings in 2019, 6.2. But he had an OK April--five starts, 30 IP, 12 ER, ERA 3.60. He only pitched 17.2 innings in May and 24.2 innings in June. In July he had 6 starts, 30.1 innings, 14 walks, and 17 earned runs--and an ERA of 5. And that was it in 2019 for David Price. He pitched 2.2 innings in August and 2 innings in September. Let's ignore 2020 and note that this year Price is in the Dodgers bullpen where so far he has pitched 5.2 innings and given up 5 earned runs. So my guess is that 2019 ST and especially the 2019 regular season only reflected that Price was about washed up. He was proof positive that DD was short for dodo bird.
Eovaldi also pitched few innings, 7, in 2019 ST. He was great the previous (2018) September and October with 20 and 22.1 innings respectively and ERA's of 1.35 and 1.61. But he stunk in 2019, so maybe he could have used the full 15 or so innings on the 2019 ST--which, as you point out, is what was done this year with so far excellent results.
All of the above is based on a simple premise: I trust Alex Cora, who was the manager for both seasons, 2018 and 2019. Rumor has it he is back managing in the bigs this year, and I still trust him.