Do you think clicking "Confirm" completes a secure transaction?

Actually, during congestion, your transaction is more like waiting in line in the mempool: first being queued with a bunch of pending "notes," miners/packagers prioritize those with higher tips, and the rest just keep waiting, until the price fluctuates, the nonce gets stuck, or it expires and gets returned. The most awkward part is that you have other operations later, all blocked by that stuck transaction in front... Recently, everyone has been talking about staking unlocks, token unlock schedules, and the anxiety over sell pressure, but I think instead of just watching the market, check if your transaction is stuck in the queue first—don't let those few minutes of "not yet confirmed" ruin your mood. Anyway, when I'm busy, I prefer to go slower and tinker less.