Actually, disabling the windshield auto-retract probably increases wear, albeit ever so slightly. Because it allows grit/contaminants to largely collect/accumulate in one area, as opposed to multiple daily retracts which help push the contaminants out of the mechanical tracks' primary travel regions.
In other words..., a bunch of crud spread out over a large area, tends to do less damage than a bunch of crud jammed into a small space.
On the other hand, if you NEVER move the windshield there's near-zero wear regardless of the crud collected in the tracks.
It's all too much thinking. I've replaced the plastic slide blocks in one Gen-II windshield mechanism. It's a total PITA for such simple parts.
That auto-retract is IMO, one of the most stupid designs I've ever seen. I totally hate it, no matter what.