It is reasonable if you understand the spirit of the law. It was not made to re-distribute land or property; but rather for land or property whose owners have "vanished" or have no more interest in that property (by even giving it away).
Actually the main reason is to limit claims of fraudulent transfer.
If adverse possession is 10 years in your state, you don't need to worry about the seller's grandchildren suing you claiming that you defrauded their ancestors when you bought your land from them. This also acts as a backstop for title insurance: title insurers are essentially off the hook for policies older than the adverse possession time.
The main goal of adverse possession has always been to protect people who bought the land from ancient+stale claims that they bought it through fraud or bought it from somebody who wrongfully claimed they owned it. Otherwise you'd have to keep documentation and proof for all eternity. At some point it has to be okay to no longer have evidence and documentation beyond what's in the public record. Torrens title systems don't change this: the point is to prevent egregiously stale claims of fraud. Fraud is the explicit exceptions to Torrens indefeasibility.
The much-publicized "squatters got free land" phenomenon is just a side effect.
