Lack of support for open standarts, such as WebDav, CalDav are showstoppers. They are more important than any UI feature. Using a WebDav would allow connecting office suites, such as OnlyOffice and synchronize calendars in Thunderbird. Proton is targeting power user and support for open and secure access protocols is key missing feature. Many such users are working in Linux desktop where Proton drive is not even available, so WebDav and CalDav is the only way to get access to data.
Lack of support for open standarts, such as WebDav, CalDav are showstoppers. They are more important than any UI feature. Using a WebDav would allow connecting office suites, such as OnlyOffice and synchronize calendars in Thunderbird. Proton is targeting power user and support for open and secure access protocols is key missing feature. Many such users are working in Linux desktop where Proton drive is not even available, so WebDav and CalDav is the only way to get access to data.