the minimum transaction fee that we can use in order for our transaction to be mined in the few blocks
You can never be sure: the estimate is based on past blocks and transactions, while the reality is based on future blocks. In this case it would probably be okay, but if you're unlucky, and the next block takes much longer to be found, fees will spiral up. The same happens when more new transactions are created.
In that case the minimum fee will quickly be above your fee, and it can stay high for a long time.
In the rare case that I want to be very sure my transaction gets included in the next block, I pay a much higher fee than recommended (for instance when ordering dinner). In any other case, I go as low as possible.
You can of course go low, and use RBF in case fees go up unexpectedly.