Assuming that:
1. Companies like Shopify do not have a shortage of qualified candidates
2. The cost of hiring a “bad” candidate is outweighs the benefit of finding the best possible candidates.
3. Tons of people who aren’t qualified also apply
The optimal strategy is one that focuses on weeding out as many bad candidates as possible, even if there are some good candidates that get dismissed as a result.
This is of course a gross oversimplification, but the key takeaway is that there seem to be enough candidates that are both qualified and able to get through the stressful interview process, so there’s little incentive to change it.
However, I think starting a conversation about it as the quoted twitter user is doing I might change it. If companies start wanting to take (real) steps to be more inclusive, they might have enough reason to change their hiring practices.