The board that you linked to isn't a D1 mini; it's just an ESP-12E (an 8266 chip with some conveniences like having castellated edges and an spi flash).
The D1 Mini looks like this: https://docs.wemos.cc/en/latest/d1/d1_mini.html
Having to add or remove resistors doesn't necessarily mean that the board was poorly manufactured nor tested. Linear regulators frequently require you to add a couple of smoothing capacitors and yet they are not considered low quality because of those requirements. Many dev boards are sold like this to give the engineer the freedom to design their circuits and make a call on what kind of characteristics their product would have vis-a-vis cost.
Sorry for the non-amazon link; I live in an area of the world where Amazon doesn't operate in.
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