Indeed, concern about how well your product might scale to handle high load and use of umpteen layers of abstraction sounds somewhat contradictory to me! (I'd a

Indeed, concern about how well your product might scale to handle high load and use of umpteen layers of abstraction sounds somewhat contradictory to me! (I'd also say most scaling problems aren't necessarily all that hard to solve, but having some idea of what limits might be hit fairly quickly if there was an anticipated need to grow the userbase is a pretty key part of building SaaS platforms. Even single user apps can suffer from scaling issues if suddenly they're expected to deal with far more data than anyone had bothered testing with. Allowing the engineering team, including QA, time to assess potential scaling issues is surely the first step.)