Not so. You are confusing the feed with the full page content.
No, I'm not. I was just being more succinct than I needed to be.
The feed will only contain links to the images and not the images themselves.
Yes, but those links are to the image as they appear in the post. So my 700 pixel wide image appears in the text as HTML that leads to that image. If the feed is used in, say a sidebar of a person's blog, then that full image appears taking over the sidebar and screwing up the display. It is also a PITA if you are developing a list of blogs and displaying the content since you never know when someone else is putting full article content in the feed. Even manually building an excerpt or summary is a PITA since you never know when an image is going to show up and what size it is.
You can see this sort of behaviour at sites like
http://figoblogotheque.blogspot.com/I've included an example.
It's always better to insert a smaller image linked to a larger one.
This behaviour presumes usage though.
My initial objection is actually to a comment in your original post.
I know of some blogs that only show truncated articles in their RSS feed to ensure you have to visit the blog.
So there are several problems here. Your comment presumes a particular way to use an RSS feed. You want to read posts in it. Your presumption leads you to build your posts in a particular way. That presumption leads to problems for people that don't share your reading habits.
RSS was never intended as a way to read a blog. The problem is that there is, AFAIK, no leadership updating or maintaining the standard and so there have been industry lead updates to the format that aren't universally agreed upon. Blogger is a total basket case when it comes to RSS. Google hasn't done anything to that site to make it easier to syndicate content elsewhere as they wanted people to use their Google signup and, while it was running, Google Reader, to explore blogs.
Some sites like Wordpress have features that let you finetune your RSS feed but since the format is effectively stuck in a world before the pre-eminence of Blogger and Wordpress it has issues that haven't been resolved.