Sandra,disadvantages are there yes,for example;
_ powers cuts, there are a lot of load shedding in our area.
_ some students can not manage to have access to smart phones and in order for online teaching to be effective students are expected to have gadgets to access the on line teaching and contribute effectively.
_ connectivity in some read is equally a problem
_ limited technical know how,can lead the teacher to incline always to the same way of teaching because of lack of technology in using other gadgets, for example, the way you were making us break in groups for discussions during webinars, can really stimulate our students but to be frank I really do not know how you were doing it.