>>107808640Because since the 1970s, DC writers hate the idea of Robin and treat him like an artifact that they are stuck with no matter what.
They got rid of him for a while via Teen Titans but when Marv Wolfman (who was writing Batman and Titans at the time) wanted Dick to take on a new costumed identity, DC demanded a new Robin be created. Hence Jason Todd.
Todd was never popular, was retooled to make him edgier than Dick, but remained unpopular and was killed off.
But DC had to have a Robin and Tim Drake was created and through constant teasing, build up hype for him by rarely using him from Batman #442-457, when he got his own unique costume and joined the book full time.
DC spent a lot of time crafting a nerdy jock persona for Tim, to make him different from Dick and making him more likeable than Jason. He was popular, with comic fans who started reading in the early 90s comic boom and soon got his own spin-off after several successful mini-series.
Robin getting his own book also solved the issue of Batman writers not wating ot use Robin. Robin is now optional and Robin fans have the solo book, so they can still read his exploits if the main Batman writers don't want to use him.
Also of note; for years John Byrne kept pitching a comic EXPLICITLY named "Batman and Robin" in the late 90s. It kept getting rejected because Batman editoral didn't want to deal with Byrne's bullshit and Byrne not wanting to play nice with other writers contributions to continuity, as seen with the damage he did in Wonder Woman.
Years later, in the 00s, DC greenlit two books with the title. Frank Miller's ill fated "All Star Batman and Robin, the Boy Wonder" and the more positively received "Batman and Robin" by Grant Morrison.
