You're certainly right about that, but I specifically responded to (and quoted) "Selling performance these days is a tough cookie when the latest version is just a spec bump and doesn’t look any different from the models it replaces."In the ~25 years that iMac has been around, the current model is the longest that one has ever been sold (734 days and counting) without an update. Regardless of whether you think the next one will have any design tweaks, going this long without an update is not "completely in line with what they've been doing". Perhaps the delay is a new normal or something boring, but we'll see how it goes.
Spec bumps and using a design for a couple of generations is not new.