For some advanced reasoning you're 100% right, but many times you're doing document conversion, summarizing, doing RAG, in all these cases GPT 3.5 performs as good if not better than GPT 4 (we can't ignore cost and speed) and it's very hard to distinguish between the two.
I would dare to say that in general most people need every day help on more simple tasks rather than complex reasoning. Now obviously, if you get complex reasoning at the same speed and cost of simpler tasks, it's a no-brainer. But if there are trade-offs...
For some advanced reasoning you're 100% right, but many times you're doing document conversion, summarizing, doing RAG, in all these cases GPT 3.5 performs as good if not better than GPT 4 (we can't ignore cost and speed) and it's very hard to distinguish between the two.