I agree with you.
When one invest in Bitcoin he Should firstly build a good solid Bitcoin portfolio and focus on it not thinking about diversifying into any shit coin, if diversifying should be considered probably into any other physical asset of which the funds are readily available and not related to Bitcoin funds or holdings.
As you mentioned which I agree as the merits of diversifying and also affirm that wealth can be made through Diversifying with the right assets.
It will be very easy for an investor to choose when he starts investing in Bitcoin and also starts investing in other physical assets. But if you want to focus more on Bitcoin, it's a good idea to place slightly larger funds in Bitcoin than in other physical assets, which can also break your focus as an investor who is aiming for large profits. I don't blame people who like to invest in any physical asset, as long as it can be very convenient for him, but for those who are already familiar with Bitcoin. It's a good idea to use this opportunity to invest in Bitcoin in larger amounts because it will be much better for anyone.