I agree. Take everything with a grain of salt. In addition, I use Fakespot. It gives products a letter grade based on how "fake" their reviews are. Not perfect, but another data point.
The vendors are starting to combat fakespot by messaging "A" accounts and offering to give them off platform refunds for good reviews. It works because even when they message someone like me, I haven't figured out how to report it to Amazon. They don't seem to have a "report future fraud" feature.