Well, however, you describe it, I would still advise people I know to invest what they can afford to lose. However, it is the lowest level to minimize losses that could occur in the future.
OK, we agree with the statement that Bitcoin has great potential in the future. however, what we have is only “belief”. When people are asked whether Bitcoin will reach $100k, people will answer "yes". and, when that will happen, the answer is "don't know". When people invest more than they can invest, borrow, or anything else to invest in Bitcoin, it's not a good thing. maybe in the future, the price will rise, but we need to consider living needs and other unexpected costs. Many people are forced to sell the assets they own when they need money, whether because of economic, health, or other factors. Well, what if at that time prices were very low, then big losses would occur, and the people who pushed to invest more would be blamed. If you had said to invest in what you can afford to lose, and they don't listen to that, then in the future, when things get worse, you can't be blamed for that.
Its a great piece of advice to only spend what you can afford to lose. This is especially true when markets are volatile. Why? As you said, the future of Bitcoin is full of "ifs" and "maybes," even though it looks bright. Undoubtedly, it will reach $100,000, but when?
Investing too much, especially when you borrow money to do so, is like taking a chance with your money. Price could go through the roof, but it could also go through the floor. If it does happen and you have to sell at a loss because of things you cant control, like health problems, economic downturns, etc., thats two bad things in one.
As a result, your stance serves as both advice and a defense against potential future blame. People may not pay attention to your advice, but they will remember them if things go badly. As the saying goes, "balance" means weighing promise against usefulness. That balance is very important when dealing in crypto, which is a very risky business.