He does explain the rationale though. They’re both things I didn’t know about canva generated files. Makes sense for them to do that I guess, it means you won’t be able to reuse any of their stuff outside of their platform.
It's good advice sure. But downgrading their work, no. Unless you have explicit requirements that aren't met like your text being selectable, downgrading work because you have a prejudice against an authoring tool isn't cool. What if another educator has an issue with Power Point, and another with Sheets. Should students have to match their authoring tool with their educators for each lesson?
Students are there to learn, no to cater to your preferences.
What you're saying makes sense... if the OP explicitly tells the students to make their work available in a shareable and copyable format. The vast majority of presentations in schools don't live beyond the moment the presentation is finished.
I see now that I should have made myself more clear. slides made in InDesign are indeed a stated requirment. Why....
I teach Design. One of the key learning outcomes of most design courses is the ability to handle long documents through their structural styles: heading 1, heading 2, caption, block quote, lists etc. Most design apps offer this functionality, even Powerpoint. However, none do it as elegantly as InDesign. I'm no Adobe fanboy (I do most of my own work in the Affinity suite) but InDesign remains the leader of the pack in this regard.
One crucial strength of InDesign is that it that manages anti aliasing of text very effectively. Just compare the output of ID to MS Word and you will see. I guess you are familiar with pdfs from LaTex? Compare those with pdfs from MS word. Similar difference.
It also does not produce or allow fake bold/italic etc. If a font does not have a built in bold then it won't fake one up by thickening the characters. This is why the font and charter panels in InDesign seem so feature-poor compared to those of Photoshop or Illusustor which offer such fake variants.
One final reason... cloud based services are risky things to rely on, especially in a uni. This year one service many students and staff used closed its doors. Caused a lot of angst.