This is wrong in my opinion and that’s a reason I do not understand the whole BTC pairings-trading.
You do net get the ‘bonus of whatever value BTC gains in the same period’, since ADA would have to double it’s price to gain the BTC gains as well.
If, let’s say BTC is at 10k USD and ADABTC is at 3k Satoshi.
BTC goes up to 20k USD and ADABTC goes to 1.5k Satoshi, it still has the same USD value.
It just means BTC is worth more USD but that doesn’t mean ADA is worth less USD.
But, if BTC goes from 10k USD to 20k USD and ADA goes from 3k USD to 6k USD like in your example, you have made a lot more which is very unlikely though (besides USD goes down the drain lol), because of my explained example above and because IMO ADA and BTC won’t go up at the same time. (IMO BTC has to go sideways for Alts to go up)
Furthermore, I can somewhat understand the XXXBTC tradings, but not fully since it is still very risky IMO.
You could have made gains the whole year and then BTC goes down the drain → your gains as well.
This is no financial advise, only my opinion and please correct me if something’s wrong.
Greetings.