They address this in the linked blog post: https://plausible.io/blog/the-analytics-tool-i-want

> When I looked around I was fully ready to pick up another tool and install it on Gigride immediately. > > Turns out there are some alternatives for Google Analytics but I didn’t find any of them compelling. Simple Analytics and Fathom are the closest to my ideal but they are a bit too barebones to be useful for my use-case. For example, it’s quite important to me what browsers versions my users are on – if I use a css rule that isn’t supported in IE7, how many users does it affect? Neither Fathom or Simple Analytics provide that answer currently. > > This seems like an opportunity to build the tool that I really want.