Usability
Interface 
User-friendliness/complexity of the tool´s interface
Intuitive, but features a lot of options.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
Dozens of Languages.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
High. WordPress collects various types of personal information, including email addresses and usernames, but only to the extent that users provide it. It employs cookies and other technologies to track visitors, usage, access preferences, and email campaign effectiveness, although users can opt out of them. WordPress acknowledges the importance of protecting user information against unauthorised access or use. On WordPress, users can limit the information they provide, limit access to information on mobile devices, opt out of marketing communications, set their browsers to reject cookies, and opt out of internal analytics programs through user settings. WordPress acknowledges users’ right to access, rectify or erase their data. It complies with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, users with an account can edit their websites at any time.
Tailorability (If so, how?) Possibility of the tool to be used for a range of different activities (e.g. to what extent you can organize a project assignment with a central activity based on this tool)
To some extent; users can use WordPress to create blogs and sites for different purposes.