Yes I totally agree with your suggestion because that way we can also keep our assets safe in the event of a price drop that we don't expect because our priority is only on Bitcoin or ethereum.
Bitcoin and Ethereum are two coins that very often go down simultaneously and also increase simultaneously too, so to secure assets into these two coins is still a little less secure so you need to consider stable coins like USDT and also others to secure assets if you are not using them for long time.