Why is Blogger so weak on SEO?
What many folks just don't realise is that Blogger leaves the SEO to us - because Blogger supports other folks rights to publish their blogs anonymously, and without SEO. It's your choice - and it's your effort to make - either way.
The choices, provided to us by Blogger / Google, are quite basic.
Which ever decision you make, controlling the search engines is a key step, on the way to anonymity - or to fame and fortune. And use of Google Webmaster Tools is a key process, in controlling the search engines.
In either case, learn the issues involved, in fulfilling your personal goal. Don't expect Blogger to do it all for you.