Damn. The experts changed their minds. Again.
No. They didn't. It's just your attempt to find a molehill from which to build a mountain.
There's no great scientific breakthroughs to report in understanding that soap and water or disinfectant are capable of cleaning a surface to remove, reduce, or kill bacteria and viruses. They simply perform that same function differently and to different levels of effectiveness. Does this really need to be explained to you?
All that disinfecting was a waste of time.
No it wasn't. Whether the surface is your hands or something else, soap and water works the same way in breaking down and removing the things that you wish to remove. Disinfectant may do the job more effectively, efficiently, or thoroughly and, depending on the surface and circumstances, may be the better choice or may be more than is really needed for the desired level of sanitation and hygiene. But in any event, it isn't a waste of time. Does this really need to be explained to you?