This is true. There are quite a few ideas on the community to vote for on this.
The easiest way to add UTMs in emails depends on which versions of the editor you are using.
If you are using v1 emails, there is no simple solutions. You will have to add UTMs manually on each <a> tag you add to your editable zones. For the non editable ones, you can use tokens that you hard code to the template.
If you are using V2 templates, the best way is to add UTM's a variables in the email for your CTA modules, then simply fill out the variables when you create the email.
Read more here: Email 2.0 Hack - UTM Parameters as local variables
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Others have used Tokens for this as well, but that still requires some level of work to have the URL string setup.
The basic way is to use Concatenate in an Excel sheet and then paste the links into each email.