It is helpful and useful. Teaching and learning processes are still going on. Knowledge transfer may be hard especially for practical part. New methods of teaching and learning have been developed to overcome such limitation.
I think that the interactions are not the same, in fact, despite the existence of applications such as Zoom, the sensations of a face-to-face class are not the same for the teacher and the students, because by Zoom, many times the teacher limits the access or participation of the students online depending on the size of the group, due to issues of order or discipline, and the classes for the teacher are rigid by the duty to comply with a stipulated content in the curriculum of the subject.
It is totally different in terms of delivering knowledge and achieving learning outcomes, also in assessing students but this is the only method we got for now. It is better than nothing.
There are many differences, however, it is yielding the same outcomes, in some cases better. We need to adapt our philosophy and general attitude towards online teaching and learning since this is the way of the future. I do miss my face to face lectures but I am quickly re-engineering my methodology to suit this environment.
we need face-to-face teaching (of course, if we have choice), it is most efficient, because all the body "speaks" not only our voice, and students often remember a concept if it associated with a special gesture. E-learning can complement face-to-face teaching but doesn't support, by itself, effective teaching and learning.
Additionally, students need to communicate with each others and with the teacher easily. They feel more comfortable asking questions and discussing ideas and concerns face-to-face: it is humanly better. :-)
There are certain communicative relationships between students that do not occur in online teaching compared to face-to-face teaching. Aspects about understanding some detail in the teacher's explanation, many times a classmate can clarify it, it all depends on how the teacher schedules the class and what types of interactions the teacher can let happen, and I really don't know what kind of speech can be the dominant one in a virtual class. Studies should be done on the types of interactions that are occurring in virtual classes.