It's simply not as effective psychoactively due to its chemical structure. This is why it can be sold legally, due to the chemical structure differing from Delta-9 THC. As a long time cannabis user, delta 8 does absolutely nothing for me.
https://jcannabisresearch.biomedcentral.com/articles/10.1186/s42238-021-00115-8
It's Lend-Lease...