The patches to the constitution aren't as deeply thought out as the original one. The Senate wasn't even an elected institution until 100 years ago, whether that is better or worse than an appointed system is mostly a false dilemma as there are more than two options. Pointing out that our constitution isn't really geared for the current process is a first step of getting more inspiration on how it could function.

When you patch one aspect it throws the other aspects out of whack.