The narrative of vapes as "tools to quit tobacco" really doesn't hold up. I'm not saying that you can't make it work, some people do, but it's not the primary use and it doesn't account for the explosion of vaping among young populations who weren't using nicotine before vaping. These companies aren't investing tens of billions into these products because they plan to help smokers quit and then stop using vapes.
By the same token the degree to which vapes help people quit is up in the air, some studies show strong effects in favor of quitting, others show strong effects that it's inferior to other quitting aids. (i.e. studies like https://pmc.ncbi.nlm.nih.gov/articles/PMC7867832/)
"These are a way for people to reduce harm" is primarily an industry narrative at this point, divorced from reality.