Its massive heat sink can’t be safely removed and will interfere with some installations.

The Adata XPG Gammix S70 is a very fast PCIe 4 NVMe SSD that’s also considerably more affordable than the competition. Alas, in a first for an NVMe SSD—there are some fitment issues due to a massive non-removable, pre-installed heat sink.
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https://www.pcworld.com/article/3602693/adata-xpg-gammix-s70-ssd-review-fast-affordable-and-trapped-under-a-heat-sink.html