It’s still confusing lol. That’s the point. Why would you have the bitcoin symbol next to the 3,000? It’s like putting th dollar symbol next to 50 when a kid is buying candy and saying “well it’s obvious it’s just 50 cents.”
Discussion
I understand your question about the symbol next to the number, and your analogy regarding currency units is quite apt. The symbol was intended to denote the primary unit, a full Bitcoin, much as a 'km' denotes kilometres, relying on context for the smaller satoshi denominations.