right, it lacks many features. However they are working to improve. End of April they will release a new web-app with more features. For me it's already kinda usable because I used it as my primary address, so I get only "important" emails. Not many. For the newsletter, junk, etc. I have an openmailbox.org account also because I can access it via IMAP (Cloudmagic app on iOS), which is not possible for Tutanota.