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I can't give specific examples, but it was very common for them to have pretty consistent major upgrades on 8 month cycles like clockwork with small speed bumps every 4, whenever Intel had speed bump processors ready for market. There may have been other incremental speed bumps at those times too like slightly faster RAM or whatnot. Minor, but nonetheless you would hold off buying if you knew a minor bump was around the corner. This 1 year or even 1.5 year between udpates crap that Apple has done the last few years isn't the norm, but Intel has dropped the ball so many times. That said, I don't think that absolves Apple from making other updates to the machines - we went what, like 1.5 years for a MBP upgrade a year or two back? There's no reason Apple couldn't have made other small updates in that time frame (screen improvements, etc) instead of chaining themselves solely to Intel.
I mean the bottom line is Apple is pushing the envelope with MBPs that now cost anywhere from $4k to $7k, which is more like $8k out the door with tax and AppleCare+ (AC+ and discontinuation of AC is another money grab). But we all know that something better is coming, and in this case Apple did actually pre-announce which virtually never happened in the past. If you bought a 2018 model right after they were released and you were 100% happy with it then, there's no reason not to be 100% happy with it now. Look at it this way, next time you upgrade it will be that much more substantial of an upgrade and that much more worth the money.
It is not just a small spec bump though it seems. Dave 2D was seeing 10 minute faster render times in Premiere (over a 23 minute file). That is a significant change and that is what is irritating about it. They improved the whole computer because it appears the Vega is not only a better GPU, but it is cooler, allowing more thermal headroom for the processor.
Based on the threads here and elsewhere, many people are irritated. And Apple has chosen to just tell us tough luck. It is what it is.