Usability problems with pinned tabs and pdf

I am using them quite extensively and maybe not only I  but it's always kinda clunky experience on chromium-based browsers:

1. If you open two browser's windows and accidentally close the first one - you'll lose your pinned tabs

2. You can add pdf file as a pinned tab but it doesn't recover last opened page after reopening the edge

3. Collections don't work as the backup for the pinned tabs because they only save tabs with sites but not with pdf

4. Аfter forced browser closure you can only pray on recovery session function, if something goes wrong you'll lose your pinned tabs again