Let's start with the worst bitcoin wallets that beginners should avoid like the plague:
blockchain.info - comes up in search results so beginners use it but is terrible at estimating fees. There are more complaints about stuck transactions with this wallet than any other. Do not use!
Blockchain seems to be a stable company, but what you say is correct. Their dynamic fee calculator is a complete joke. It's worse than useless. If you want to enter custom fees, you need to know what you're doing, because the blockchain wallet does not support entering fees in sat/B, does not even tell you the transaction size and if you enter a fee that's higher than their recommendation, it will give you a warning as if it's grossly excessive. In addition, the blockchain wallet does not provide RBF so if you have a stuck transaction, all you can do is wait and hope that blockchain won't keep resending it. On top of all that, blockchain support is completely useless. You may as well send an email to Santa. Why do I know this? Because only this morning, two stuck transactions that blockchain resent finally confirmed. One was stuck for almost two weeks, the other for more than a week. The only reason they finally cleared is because the mempool is finally getting less backlogged. Blockchain is a great example of a company that's only around because of past reputation. They are ripe for some competition to come in and take their business away.