I disagree. It's one thing to point to one pair of shoes or one rubber sole and say cements are adequate even in the absence of stitching.... If cements were adequate for rubber, they'd be more than adequate for leather which has pores and fibers for the cement to bind to...unlike rubber. And yes, you do see leather soled shoes manufactured with nothing but cement. Presses and heat are used and still cement construction is considered one of the worst and most unreliable methods of making a shoe. If cement construction was all that adequate why haven't the big manufacturers abandoned stitching altogether? Every manufacture is driven by the need to maximize profit. That's a simple economic fact. Stitching an outsole, especially when it is channeled, takes time...and specialized machines and materials. No sensible manufacturer would do it unless it were thought important. To come full circle...it's easy to look at one pair of shoes and say the cement will hold. Until it doesn't. It's quite another thing to deal with shoes that come into a shop for repair that are not worn down even 50% and yet the outsole is flapping in the wind. It's one thing to have experience with many different brands...and materials, and techniques...and quite another to speculate based on limited experience. Cements are good but ultraviolet rays, oils, salts, gasoline, acids, etc., affect and degrade the bond. But no matter how much cements themselves have improved or how good they are... the problem is with the rubber. As I mentioned above, cements don't bond to rubber very well. And as a consequence, once that bond is undermined, it spreads.