The real problem is finding somebody at Toro that can help you, i.e. isn't just an ordinary CSR who can't help you with anything other than order part XX.XX.XX.XX for you. Probably never get one via email so you really have to call and take notes of who you talk to and how you got there and then eventually find somebody that can help you.
As far as lawn mowers, I grew up about 30 years cutting the lawn for my family's 1/4 acre and we never sharpened the blade. The running joke was that we were bludgeoning the grass to death.

But we had a cheap Craftsman that lasted forever, pull start, front wheel drive.
Jay