People use stable coins for sure only to maintain their value. And for payment it is certainly very suitable, because the value is not volatile like bitcoin. So that for payment it is suitable for payment. Actually coins are stable in crypto as well as fiat $$$.
When the market crashes, investors or traders will keep their assets on a stable coin because this is a safe way to save assets from slumping, therefore stablecoin becomes much sought after when the market is down and indeed in terms of payment many use stablecoin.
Exactly, that's the strategy of a safe and secure option to avoid loss. And yes stable coins are mainly to minimize the volatility of the price, when crypto market goes bad stable coin is a safe haven.
And yes you can transfer funds between wallets and exchanges if you invest in stable coins. And the most important thing is the profit of any investment is depend only on the popularity and adaptability of coin.