Talking to The Telegraph, Freeman says the show's massive popularity meant it was difficult to keep meeting fans' expectations. Especially the ones who really, really wanted Watson and Sherlock (Benedict Cumberbatch) to hook up.
"There was a chunk of people who just knew [Season 4] was going to end with us getting together. Me and Ben, we have literally never, never played a moment like lovers. We ain't f***ing lovers," he fumed to The Telegraph.
"To be absolutely honest, it [was] kind of impossible," he told the British paper. "'Sherlock' became the animal that it became immediately... it was frankly notably high quality from the outset. And when you start [that high] it's pretty hard to maintain that."
He added, "People's expectations, some of it's not fun anymore. It's not a thing to be enjoyed, it's a thing of: 'You better f***ing do this, otherwise, you're a c***.' That's not fun anymore."
When asked if a fifth season is being discussed, Freeman replied, "Not massively... I think after series four [it] felt like a pause. I think we felt we'd done it for a bit now. And part of it, speaking for myself is [due to] the reception of it."
In January 2017, "Sherlock" showrunner Steven Moffat admitted that Season 4 might have been the last season after all.
Both Freeman and his "Sherlock" costar have both kept busy: Cumberbatch reprised his role as "Doctor Strange" in last year's "Thor: Ragnarok" and the upcoming "Avengers: Infinity War." And Freeman was one of the "Tolkien white guys" in "Black Panther."
So "Johnlock" shippers might have to hope that Freeman's Everett Ross and Stephen Strange cross paths at some point in the MCU.