The usability and functionality of email template

I have been testing the feature of campaign these days. And the test of email template of course is part of my job.
After two days’ test, I think I need to let you guys know about some of the findings I got during my test.
My first finding is that I found the editor is not easy to use, especially the image is not easy to choose if you want to set a url for it.
Perhaps just I don’t know how to user that editor?
My second finding is that when I was attempting to put some html code which I copied from commercial email template into the source code, I found that part of css code were filtered.
Even if I tried to update the corresponding field of data table email-template, then found that part of the css codes were striped out.
I got some old posts regarding this issue
https://suitecrm.com/suitecrm/forum/suitecrm-7-0-discussion/21965-email-templates-don-t-accept-externally-generated-html
https://community.sugarcrm.com/thread/19205
found that I am not alone struggling with this issue. And the only method seems to be feasible is manually coding, like the final part of above post mentioned.

My first question is:
is the email template produced by suiteCRM email editor responsive or not? I tested it and found probably not.
Could anyone give me an implicit answer?

My second question is actually for developers.
Would it be possible to develop a feature of import as well as export?
I have tested at least two products which have facilitated this feature. With this feature, you are able to import a template, after text and image customization, you may export it. If suiteCRM is equipped with this powerful feature, the functionality of this module would be improved greatly.

Thank you.

This post might be helpful
https://suitecrm.com/suitecrm/forum/suitecrm-7-0-discussion/21965-email-templates-don-t-accept-externally-generated-html#78516