My 2016 Newmar Bay Star Sport with three slides has manual locks. Two of the locks are a real pain to get to even with the supplied tool which if you’re not careful can damage the wall. Many don’t lock those lock as a result. I’ve not had any issues with not using the locks. I do set the locks that are directly behind the captains chairs main to eliminate the rattles from loose lock arms.
I can attest that should you try to extend the slides with the locks engaged you can cause damage that can be really expensive to fix. So do what you need to remind you to check the status of the locks, especially if you have taken the mh in for service. They may have set the locks.