Godspeed, recently confirmed to return as a more prominent villain in Season 7 of The Flash, is certainly not the first evil speedster to go up against Barry Allen. Many have come before, with the first evil speedster being Season 1's Reverse-Flash. Since then many a villainous speedster has confronted Barry, and frankly, it's been overdone. To again focus on another speedster is a mistake. It's time for The Flash to commit to moving forward instead of repeating the past, especially following the events and additions of Season 6.
This is not to say the main villain being a speedster was never enthralling, as having an antagonist with similar powers to The Flash worked really well in the beginning. There is good reason that trope is commonly used in comic book adaptation origin stories. Going up against a more experienced and evil shade of himself while grappling with the realities of his new powers forced Barry to not only grow in ability but also character. By the end of the first season he proves his worth as a hero. Additionally, defeating The Reverse Flash helped Barry find himself, and the show find its footing. But while at first the challenge villainous speedsters posed to Barry added to the show and helped develop his character, the overuse of the trope has begun to subtract. There's no longer a point to them anymore. The Flash continues to fall back to sameness with every new speedster villain and is in turn losing itself.
The beginning of any superhero franchise needs to develop the hero first and foremost and cannot afford a villain that overshadows the heroes first journey into their new world. A villain with the same powers as the hero is the perfect way to do that. The Reverse-Flash added to Barry's journey. Zoom, another speedster and one who was faster than Barry at his best, continued that development. But by Season 7 the hero is already well-established. The viewer knows Barry by now, Barry knows Barry by now, and another speedster to fight adds absolutely nothing. They can no longer prompt character development, as they've already served their purpose in Barry's journey.
Furthermore, Barry has already bested Godspeed before. This basically assures a static plot and sameness in characterization that doesn't prompt excitement or the thrill of anticipation. It's the same story, just a different speedster, and it'll obviously end the same way it has in the past, time and time again.
The Flash has had plenty of other adversaries that have challenged him in ways speedsters can no longer. These antagonists have shaken his world, not just his identity. Take Season 6, for example, and Barry's quest to save his wife, Iris, from the Mirrorverse. His struggle with loss is explored more. Instead of challenging his abilities, his morals are challenged. Season 7 should continue with these themes of struggle and how events impact him and the people he loves. Focusing on new inner turmoil and struggle instead of old challenges he's overcome multiple times is the direction The Flash has started and should continue taking. The danger of focusing on another speedster is that their battle and conflict could distract from all the other events that are challenging Barry. More of the same can hinder the development of newness and the opportunity of adding depth to a character many viewers have come to know and love.
The Arrowverse has many passionate fans who tune in to every program, excited by the crossovers between the shows, and dedicated to each individually. Many would probably love to see new characters, both adversaries and allies. So many seasons in, The Flash should be exploring new territory, adding to the universe. Instead the show is getting lost in a trope that no longer serves a purpose to the character or his world. It'd make for much more compelling television to introduce a new, different, villain for him to defeat; one the audience hasn't met, one they don't know and one he doesn't know.