Alessio from Layers-0 thought my Vass boots were really well-made and had a nice shape and he's one of the guys in this niche who actually knows a lot about leathers and shoe construction. On the other hand I don't feel like the products are interchangeable at all, I prefer simpler boots with cleaner silhouettes and don't wear any of the boots discussed here anymore, mainly going for products at the margin of MC wear (Corthay, Vass high boots, Massaro, Georg Materna etc.) or plain old designer boots (MMM, Balenciaga). If I wanted a Carpe/Layers-0/Guidi/CCP/Augusta etc boot I def wouldn't accept substitutes and would suck it up and pay the price for exactly what I wanted. You don't need 8 pairs, 2-3 is already enough for a very consequent wardrobe, especially if you add 2-3 pairs of sneakers.