Some blog owners use Blogger, as a lightweight website platform.
A normal Blogger blog consists of posts, which are published as dynamic pages. Static pages, used in a normal blog, are extra content - that's typically hidden from direct view, and intentionally not indexed by the search engines.
A website, on the other hand, will typically use static pages as content. Static pages, by default, are not used as blog content.
A website, published using Blogger, won't be indexed by the search engines - since it has no indexable content.
Static pages were designed to be invisible to the search engines.
Most blogs contain posts - and post content is indexed, using the posts sitemap. Blogs that have their content in static pages don't, by default, get indexed by the search engines - since static pages are, by design, invisible to the search engines.
If you publish a static website using Blogger, and you want the website to be reliably displayed in search lists, you have to have the static pages indexed. Without indexable content, a blog or website is not going to display well, in a search list.
This is not to say that static pages won't be indexed, at all. There will be no deliberate, sitemap based indexing - but there is always the possibility of random links to static pages, within your blog, and from your friends blogs - and random links can generate some indexing.
To get your website visible, you have to get the static pages indexed.
To get the pages reliably indexed, you add the pages sitemap to "robots.txt".
With the pages sitemap included in "robots.txt", the search engine robots will crawl, and index, the static pages.
If you want your website to be useful, you need indexable content.
Pages or posts, though, if you want your blog (website) to be indexed with any visibility, you still need informative, interesting, and unique content.
Without content, the blog will be invisible to the search engines. You'll get your visitors directly, as readers who type the URL from your advertisements, and your business cards that you give people.
An Important Update
If you did not use a Blogger / Google account when you Followed this blog, years ago, you are probably not Following now . During the past...