I don't really care which one, if I see that USDT gives more profit to trade than BTC than I will do it also vice versa. You should not stick to the one way only, you have to try different method and ways of earning, that's why lot of you guys are failed because keep sticking with one method only.
I disagree with you, that's kinda stupid thing to do with zero consistency. If you rely on USD means you might sell your altcoin when bitcoin price is moving up and the altcoin price you are holding is falling. In this case you could have more USD value with less Bitcoin. If you think every Satoshi will be very valuable in the future, then you aren't smart trader (apart from cut-loss, it's conditional) otherwise if you think Bitcoin is just another shitcoin in the future, you could be right.