Subscribed Emails are going to be plain text telling you what Threads have changed and allow you to click to each Thread.
When you go read the Thread it will have highlighted areas that are new since you last read it.
Also, changes are going to be batched hourly to eliminate the "get an email for every update".
This will be coming in a few days along with some other cool features.
I'm going to change this to "Not a Problem" because we have a plan of attach for this... and that is to dramatically simplify the emails and make the Threads page clearly display all the changes.