Yeah right, and I think even closed-source wallets can be modified the transaction fee manually aside from open-source wallets.
When doing a transaction, we should always refer to the mempool to see the status of the network, because when setting a fee that is too low may result in a delay in transaction confirmation, while setting it too high may lead to unnecessary fees.  So, it's important to monitor current network conditions and adjust your fee accordingly to achieve the balance between speed and cost that you want.

Sorry but it's kinda off-topic, I think it's good for them to remind after making such a transaction you can use a free Bitcoin transaction accelerator.  I used ViaBTC to rebroadcast my transaction and put it on priority on the mempool.  It has a limit of 100 transactions per hour.