Yes, agreed. It's all about the execution. The fact that they planned this season (unlike the last two) helps. DeVoe's reasoning and endgame is key in whether the story ebs and flows.
A two parter would be good. If it were to explain what Dawn is doing in the past. Or if they wanted to do an Earth-19 two parter for a filler that does drive the plot. For example: the machine Savitar mentioned that they need to stop DeVoe requires equipment that can only be made on Earth-19. The Earth-2 episodes were such a success. I don't know why they haven't leaned into. Fans love seeing different versions of Barry, Iris, Joe, Cisco etc.
I would loveeeeeee for them to have a re-do. I can't even put into words how much the crossover angered me off.
Westallen have a knack for doing things several times over, so why not this? It's what we deserve.