Tapping into both my own uni graphics design and a past life as senior exec at a mega corp: because designers that use bad tools to make unusable presentations are failing "you had one job", to make something presentable across the variety of business modalities.
Being able to email the presentation and copy text from it are generally more important to communications impact and utility in the workplace than how it looks.
Being aware what your tool does to the presentation is part of the job you're learning in school.
In Canva we do care about accessibility. While I admit our editor may still have a long way to go on providing an accessible editing experience, unselectable text in export result is more likely an overlooked bug than anything intentional.
And if you're coming from the Affinity side, don't worry your new corporate overlords DO care about people, and employees are their #1 priority </empty_talk>
same reason you'd downgrade a programming student if they handed in an assignment as an Excel macro? Not just because of the VBA but because to use it you now need to buy MS Office?