Burnes only a "good" acquisition? I bet if the Jays acquired Burnes last offseason, you would be salivating and kissing the floor Atkins walks on lol.
Orioles actually have a decent rotation. It's wasn't an expensive or aging one like the Jays entering the 2024 season. Included Grayson Rodriguez, Kyle Bradish (3.8 fWAR last season), Dean Kramer (decent back-end of the rotation guy), and Albert Suárez has been a nice find (approaching 2 fWAR this season). Let's compare that with the Jays current group this season? Burnes was definitely a great addition who solidified their rotation, and gave them a true No. 1 starter.
As for the trade deadline, Eflin was a great addition, though sucks he landed on the IL. Rogers has sucked for them but he was brought in just for depth/back-end of the rotation. He's not pitching in the ALDS or ALCS at all as a starter anyways lol. He did post a 4.3 fWAR in 2021 so maybe they thought a change of scenery could make a difference. As for Eloy Jimenez, that was puzzling but I guess they thought if he got out of Chicago, maybe he recaptures that magic with the bat in his first two years up in the Majors. Would have went after a better bat if one was available.