Is a slide out roller topper needed?

Fifth wheel here but same issues with or without. This is our fifth towable. This one and the previous had slide toppers, but the previous didn't come with it over the only full wall slide, we had it installed and it was about $1800 dollars. That one flapped a lot in the wind. With our fifth wheel, they don't as much. Same brands though. With our fifth wheel, we have slide toppers on all three slides. The largest gathers water, the shorter ones do not. the largest flaps a little in the wind, the others do not. So there's a pattern here with the length of the topper. Either way. We wouldn't be without them. They also keep the inside cooler in addition to cleaner. On the rigs we didn't have toppers on the slides, we would notice dirt and leaves inside. With toppers, nothing.