It takes three mouse clicks or two mouse clicks and one keyboard return to delete each downloaded investment transaction. That's a lot of work when Quicken enters 1 month and 10 days worth of garbage into the downloaded transaction list; like todays CvrShrt transactions on Fidelity investment accounts. Specifically on that issue there can be one transaction per business day (for the sweep fund balance) so in the worst case I could have had 29 bogus transactions in each* account (I have four and they all have correctly recorded sweep funds, up to 348 key mouse clicks required).
This is a general problem; I've complained about the inability to do bulk edits on investment registers before and that was fixed but in this case either bulk edits on downloaded transactions or a keyboard shortcut are required. Every UI case with a confirmation popup is absolutely a potential UI issue.