So what is stupid here?
If your Standard Preview size (set in settings) is larger than half of original image then 1:1 Previews are used for them.
That's why they are not deleted.
Yes that's what I'm saying. The option to delete the 1:! previews is obsolete because they don't get deleted. But I would like them deleted in after the amount of time I can specify in that option.
You just don't get it.
If you have Standard Preview size greater than 1/2 of the original resolution, Lightroom uses 1:1 preview scaled down.
This is done to show you accurate preview.
So now tell me what's your expectations?
Is that if you have 1:1 set to delete after 14days should LR delete them, and then regenerate when needed?
But that's a waste of time, because Standard Previews are always needed and just browsing thru grid will force their regeneration.
And with your particular settings Standard Preview and 1:1 Preview for image is the same.
Could you explain in details what's wrong with current design?
Well yes if I see an option that allows me to delete 1:1 previews after a set amount of time I expect the program to do that. Knowing that it will have to recreate them if I go back to an older project, but for this I can set a reasonable amount of time to keep them. But I don't really need 26GB of preview photos in the LR catalog folder, yes just do as the option says and get rid of them and just show the ones embedded in the raw while creating new ones, if I revisit old projects.
It just simply doesn't do what it says its supposed to do. Either change the setting or let it do what it actually says.