Too Long; Didn't Read
EIP 1559 has been subject to the most scrutiny owing to its overhaul of the network’s much-discussed (and often lamented) fee structure. Some users may choose to pay higher gas fees to put themselves at the top of the pile and ensure their transfer goes ahead smoothly. Other users choose the opposite route, opting for a lower gas fee to minimize cost, which leads to uncertainty of whether the transaction will get processed in a timely fashion. The base fee itself will vary, going up when the network is busier and down when things are calmer.