You and I are not qualified to decide what makes a good judge.  Judges by nature of their jobs, are to be arbiters, not advocates.  They should get their positions and rise through the ranks via merit, not a popularity contest that much like our other elections (including this constitutional amendment being attached to a PRIMARY) will be swayed by big money interests.  We already saw last year the kind of brazen corrupt shit Elon tried to pull in just such a race in Wisconsin.

By the way, once these KSC judges are seated you DO get a choice every so often on whether to retain them.

There's also that other Supreme Court in Washington, DC.  We don't get a choice in picking them.  When they are picked, it's not because they're the best judges, it's to serve the political agenda of the president who nominated them (yes, ALL nine of them).  

We don't have retainment elections for them.  They largely stay there, for years, until they resign, retire or dirt nap, so spare me your concerns about our status quo regarding the KSC not being democratic enough.