I agree with you that investing in Bitcoin while learning is more suitable for people who are new to Bitcoin. In that way, they have a feel of what it means to be invested in Bitcoin and how best they can chanel those knowledge into practical use. Learning never ends because everyday comes with new discoveries and innovations. So, it is always better to start investing in Bitcoin even if with the least amount we can afford to set aside for investment, while seeking wider knowledge.
You have a point because one of the best way for most people to understand what it takes to be an investor is by practicalizing it in such a way that they will understand perfectly, so in as much as there is a need for people to learn about Bitcoin is also very important for the person to start investing while learning immediately because that's one of the best way to understand more better.
The need to invest while learning is also for people that has a perception of seeing is believing, so however seeing the practical aspects of what they are learning will enhance there learning zeal and motivate them to know the needs why they should invest on Bitcoin. Perhaps even me what motivates me on most things is being able to practice while learning.