Up until around 2014, preorder numbers were strongly correlated with financial success. They were used as the main metric for determining an upcoming game's chance of hitting its goals. Unfortunately, this caused a common feedback cycle problem with key performance indicators - the more you optimize for the metric itself, the less that metric continues to correlate to what you actually want to know. Publishers and retailers pushed various tactics to pressure customers to preorder, which did result in more preorders. However, the artificially-juiced preorder numbers didn't correlate as strongly with the success of the games. As lifestyle games grew into the biggest chunk of the market, preorder importance fell even more because it was the lifestyle game populations that were most strongly correlated with financial success.
The quality element you mention has nothing to do with preorders. Most games have two to four years of total development time before they ship. Preorders for those games often aren't available until a few months before the release date. By the time the preorders numbers actually come in, we're nearly finished with the development process. The timing doesn't line up at all, there is no way we can cheap out on quality in the last few months of development when the majority of that work is already complete.
As for whether I think players should preorder... I'll tell you what I do personally when it comes to purchasing games. I don't care much for preorder bonuses in general - they are almost always very small and won't affect the overall gameplay in any significant way. Preorder bonuses are generally limited to cosmetics at best, and the gameplay itself matters much more to me than having a particular outfit or weapon skin. There are some games I will preorder because I really like the game or franchise and I am concerned that the publisher has limited print runs of that game (Atlus, for example, is famous for having small print runs). Aside from that, I usually wait to see how the game does at launch before buying in. I don't feel much pressure to get in on day 1. Waiting a week or two won't kill me, and I've got plenty of other games to play and things to do in the meantime.
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