I think it gets more critical as you move up the NTRP chain. My first season at 4.5, I was amazed at how much harder it was to hold serve based on my serve alone, so I had to really focus on being on point for both firsts and seconds.
That being said, I am still mostly aggressive on my second serve, and am OK with hitting 2-3 doubles if it means that I hit 6-7 unreturnables and start most points off with an advantage rather than neutral ground.
Back to the Prestige MP. Should have never deviated.