Patents aren't there to promote innovation, they usually do the opposite so the original inventor can make bank. There's no competition or incentive to perfect your product because you're a state enforced monopoly.

Take FDM 3D printers for example. Stratasys figured out and patented the first one almost 35 years ago and then proceeded to do fuck all with it, selling mediocre garbage for sky high prices. After it expired in 2009 3D printing rapidly became a whole industry with dirt cheap hardware, enabling millions to make things never before thought possible. We could've reached that point in the early 90s if it weren't for patents.

Sure one might say, it also forces the patentee to disclose the inns and outs of the invention, but frankly those patent descriptions are often as bare bones as possible and you'd get there reverse engineering any product far sooner than 20 years.