@ericmwalk I’m not sure there’s a clear pro or con. There are plenty of very active, engaged folks here on Micro.blog who nevertheless use external blogs (WordPress, Blot, Hugo, &c, u.s.w.).
For the first year I was on M.b I ran a WordPress blog that fed into the timeline, because at the time WP gave me greater control over what posts appeared in the timeline and which were posted only to my blog. (This has since changed with the advent of categories and filters based on post-length.)
I began paying monthly for a membership partly to try the service, but mostly to just show my support. But the experience was SO MUCH EASIER than wrestling with WordPress, that I went all in with a hosted blog maybe a month later, and never looked back. That was two years ago.