Hi!
Of course open questions give us more information. From the video interviews you will get very good information.
The problem is that we would have to translate all those answers into English. Each partner should make the transcript of the response.
In addition, participants if they see many questions to write will not respond. We can put maximum one open question.
It is very important that the questionnaires are written in the different languages: option of change languages, differents links…
Nice day,
Idoya