For people working towards or that have an audiophile system they must be concerned with all aspects of a system that may have an impact. In the end every minute detail matters. But, as the OP pointed out this is not a highly resolving system. If you start working towards one, then, one of the steps will be to buy high end speaker cables… at that point they should be of the same length.
In the mean time… one highly recommended speaker cable to consider (let’s see if I can get this right); HD12-3? Years ago either Stereophile or the Absolute Sound did a comparison of a number of low to intermediate speaker cables. They threw in a Home Depot extension cord… ends cut off. It actually sounded pretty good… didn’t win against $1K cables but sounded way better than lamp cord and Radio Shack 18” gauge speaker wire”. I loved the article it was great fun and informative. While I use $5K Transparent cables on my main system. I use HD12-3 on my office system… hidden because of the orange and black color behind my desk.