Thinner: When you 1) want a quieter GPU, 2) are too cheap/lazy to water cool, and 3) have an itx case that can't fit a 2.5 slot card without an unsightly bulge :
NVIDIA L40 Omniverse GPU Launched
Intel Rebrands Artic Sound-M To Data Center GPU "Flex" Series: First Products, The Flex Series 170 & 140 Break Cover
GEFORCE GTX GPU Bracket and MSI GPU cover - YouTube
So making a PSU GPU cover wasn't enough i did also a ram cover (sides are open to avoid heat trap, only top to hold and front to cover) : r/pcmasterrace