I agree that speedy mons are handicapped, and it is a bit sad. Also many pokemon that were made viable by their abilities are totally useless on Go. I really hate that Niantic is trying to balance their game based on less than HALF of the original game mechanics, totally ignoring speed, SPA, SPD, abilities etc.
Balance was never good in the original pokemon games to begin with. I wish that Niantic would stop this half-assed copycat theme since they cant do it properly, and would make their own balance mechanics. It doesnt even have to be based on the original games. Just make more pokemon viable and stop this "5 top tier pokemon and the rest are shit" meta.
Edit: And if for some reason they do want to continue this copycat theme, atleast do it properly. Copy the whole system from the original games with all of the stats and abilities. Make it turn based etc. All of the data already exists, they dont even have to "do anything", all of the leg work has been done already. Atm it just feels like Niantic has no idea what they want to do or can do.