We have what appears to be a shiny floating object. What data do we have that can't be explained by a shiny balloon?
The thing that bothers me the most about this sort of discussions is that it's all done on "paper"[1]. It would be helpful to actually release a balloon, or whatever object you think it was, and check if you can reproduce the glare and other sensor data.
If it's very easy to reproduce then we can be more confident in that explanation and probably nail down more detailed characteristics of that object. Once we have that we can look where this object could've come from. For example, if it points to a balloon, did a company/organization lose a balloon in that time frame? Once we have all this info we would have an explanation that's more robust than someone saying: "It might be possible this and potentially that"
This requires money, time and the hardware. So I guess it's unlikely that will ever happen.
[1] Not saying it's useless. Those calculations and/or simulations are very useful to limit the types of objects it could be.
It's very normal to not be able to prove what caused an event. This morning I heard a sound, it sounded pretty much exactly like a car horn, but maybe it was something else. We'll probably never know.
It's an excellent point that any organization serious about determining the cause would be conducting experiments, I can go honk some car horns and see if I find one that sounds similar. It doesn't seem like that happens with "UAP research", or the US Navy