Also consider how often you are likely to use the bike with the top case on - if you are going to leave it on permanently then that’s one thing but if you plan to frequently remove it, having the addition wiring lead is a real P.I.T.A.
I have the centrally locked top case with the extra brake light which I use very infrequently - the real pain is having to remove the passenger seat to plug it in. I would probably use it more if I didn’t have to go through this process.
That's a good point, and truth be told, other than long trips or riding 2-up with my wife, I don't really even need the side cases let alone the top case, but out of habit I leave the side cases on but do ride without the top case, most of the time.
However, what's the liability if you simply zip tie off and tuck the cord on the case, and mount it without connecting the lead. Now that you've prompted my thoughts on the issue, if I'm running to the local store to pick up a gallon of milk, etc., that's exactly what I'd do. I don't "need" the autolocking feature, and I rode for years with a top case that had neither that locking system nor the brake lights, and was none the worse for it.
Anyhow, it's something for you to consider, i.e. it might work for you.
(The biggest issue for me in my small garage is where to store the dang thing, if it's not mounted on the bike. 🤣 I mean, it's a beautiful new case, and I'd die if it got scratched up or chipped because it fell and hit the floor, or something like that 'cause of storage.)