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On the other hand, in the paas industry, it should be axiomatic, i.e., understood by all competent parties, that horizontal scaling (the "infinitely scalable" bit) manifestly will NOT address problematic architectures, n+1 queries, full table scans, poorly/non-indexed schemas, etc.

The problem with this is that the original post doesn't say "I have a site that was crashing and locking up all the time, so I took it to WPEngine." It says "I have a site that was running fine on a VPS at Linode, but I got tired of the hassle of managing the VPS, so I took it to WPEngine."

The original post is written by the complainant, of course, so it's possible it's subjective or slanted. But if it's correct on this point, I don't think it's unreasonable for a competent party -- in this case, a person with a WordPress site that runs acceptably on a commodity VPS -- to expect that it would run acceptably on WPEngine as well. Presumably performance killers like the ones you cite would be just as bad on the VPS -- if not worse, since it's unlikely that a VPS' operator will be able to tune MySQL, PHP, Apache, etc. to the degree that an expert at a place like WPEngine would.

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