Submitting assignments online through the VLE is a great way for learners to ensure a) that the work submitted is logged, b) it’s unlikely to be lost, c) they can, once graded, refer to the grade and feedback when they want to.
The problem with submitting assignments through the VLE is when the assignment asks for the students to submit a physical thing as their assessed piece of work.
If a learner creates a sculpture for example, or makes a lasagna, welds copper tubing, these things can not be submitted electronically. Submitting a photograph is of course possible, but why? It’s an extra step that isn’t strictly necessary.
Many learners will often do a presentation for an assessment, others will do a live performance or demonstrate a technique. Now yes you could video these “performances”, but video files can be quite big and you not want to upload these to the VLE (especially if you use tape over an SD card).
However it is still useful to grade these offline activities on the VLE to inform the learners how they did and provide feedback. Of course generally that is done anyway, so why put it on the VLE?
One reason is consistency, if other (written) assignments are been uploaded to the VLE then a learner will probably want to at some point know the grades for all their assessed work regardless whether it was a written essay or a live presentation.
Another reason is that one of the key factors that aids retention is ensuring learners know in terms of their assessment what they have done, what they are doing and what they need to do. If they can find all this information in one place rather than using different systems for different assignments using differing forms of assessment then it will make life better for the learner. If feedback and grading on written work is on the VLE, it makes sense then to use the VLE for all assessment whether it be written or another activity.