Especially for smaller amounts, it may really be simpler, cheaper and safer to leave them on the exchange. This may also depend on the exchange (size, reputation, ...) - some are more likely to pull off an exit scam than others.
That's also true. OP shouldn't just consider the withdrawal fees, but also what the minimum withdrawal amounts are on the exchanges where his coins are currently stored. I can't remember why I needed to use a Chinese exchange called Bibox. Most have been several years ago when I was getting rid of some altcoin. Anyways, that exchange is currently holding 25 USDT of mine. They have been there for years. Even if I wanted to pay whatever fees they would charge me, I can't touch those coins because their minimum USDT withdrawal amount is 40 via the TRC20 network, 50 USDT over Ethereum, and 60 for the OMNI layer. Another element to take into consideration unfortunately.