Fail to go back and clear them out, mostly. Most were left open because of something relevant at the time, so I mostly need to spend a little time going through and nuking or nothing. There's been little friction due to leaving them open so it hasn't been a priority.
Pretty much the same thing that leaves some people with tens of thousands of messages in their inboxes (I deal with someone who does that and it makes my teeth itch, so my inbox isn't so bad).
Right, my private Gmail inbox has more than 70,000 conversations (no clue how many messages). Using search I typically find quickly what I want.
As a programmer who has spent significant time with performance work, having useless tabs in a browser would hurt me. But that Google has to search through a bit longer list of messages I can accept as the typical wastefulness of computing these days. (I am old enough to have done time-sharing on 4 MB with 11 other students on their VT100)
Fail to go back and clear them out, mostly. Most were left open because of something relevant at the time, so I mostly need to spend a little time going through and nuking or nothing. There's been little friction due to leaving them open so it hasn't been a priority.
Pretty much the same thing that leaves some people with tens of thousands of messages in their inboxes (I deal with someone who does that and it makes my teeth itch, so my inbox isn't so bad).