The Gmail tabs are total bullshit. For years I had been pre-ordering this limited edition, numbered series of books... with a certain number reserved so long as I kept my pre-orders active as they became available... and a couple months ago it occured to me that it seemed like a while since I was sent my last "pre-order available" email. I searched my inbox for the author's name and BAM - literally dozens and dozens of missed emails popped up that were invisible to my "regular" inbox because Gmail suddenly had the brilliant idea of filtering out tons of my important shit into a completely separate Promotions category (that I had no idea existed). The sole reason for the new tabs are to maximize the number of personalized ads Google displays on screen, after all if you have to click on many different tabs just to see the complete contents of your inbox each tab is a new separate screen of fantastic ads. Great thinking Google, super convenient. I had missed out on my opportunity to pre-order the next one by a month, and thereby also lost my reserved number and ability to order any of the others in the series... that I had been collecting for several years. I immdiately disabled all those ridiculous extra tabs I didn't know existed, but by that point the damage was done. Fucking Google, fucking assholes.