I'm of the lawn care school that says "If it's green and the mower can cut it off, it's grass." Consequently, I have several different species of "grass" in my lawn, some even planted on purpose. When I mow, especially this time of year, it looks great when I'm done, but by the next day some species have grown faster than others, and it looks ragged.
I learned long ago that there are things that are a lot more important to me than a lawn that resembles artificial turf. So I sharpen my blades when I think they need it, or when I get the time, and do it with the bench grinder in my garage. I eyeball the angle, check the balance with a cheap balancer I bought 30 years ago.
It's lots easier than sharpening the sickle bar from my old hay mower was before I got an angle grinder. And the blades keep cutting the "grass" just fine.