In my experience, this is true 99% of the time when you're the only band playing a 3-hour set, or even one of 2 bands playing 90 minute sets.
When you're playing 30-minute sets with 3-4 bands, I've had a huge range of experiences with engineers. It's usually mostly driven by the setup at the venue. I've basically settled that if it's a small show, we just run cabs and wedges, especially if we're not headlining. We just pick what makes the most sense for each show.
With the bigger shows, I have to go in being flexible if we're not headlining. I've had one engineer get PISSED when I asked if we could use our IEM rig, but when I was totally flexible and willing to use HIS split instead of ours, it worked out well and he ended up really enjoying working with us and kept chatting with me about sound stuff. Another show, the headliner took up all the sound check time so we only had 10 minutes to get 3 bands' gear on stage so IEMs were out of question. But then, we played a show with much bigger bands and the sound engineer was super thankful we had IEMs because the stage was shallow and didn't even have room with wedges with 3 kits on the stage. And many experiences where it's just a non-issue with a crew that knows what they're doing.
So yeah, those are some anecdotal experiences that no one asked for, but there ya go.