Recommended fees are an estimate, based on past confirmed transactions. Fees can go up, for instance if it takes long to find a new block, or if the number of transactions goes up. If that happens, the estimate turns out to be incorrect.
When in a hurry, I manually set the fee a bit higher. Most of the time I manually set it as low as possible.
For now, using the lowest possible fee is fine with BTG, because there’s no congestion.
When/if the blocks get congested, the usage of an adequate fee may make a difference in how quickly your transaction gets confirmed.