Was actually surprised that ETH had able to retain the no. 2 spot despite of having that high fee issue which had been sitted for a while now and still unresolved.
I am not surprised that ETH is still the top altcoin, I agree that ETH's high transaction fees and slow transaction processing are a big problem for ETH also with the delay in ETH2.0 upgrade also causing ETH is affected. But you will not find an altcoin that is more secure than ETH and the most decentralized of all altcoins. Recent altcoins trade off decentralization for cheap transaction fees and fast transaction speeds, this is unwelcome and goes against the decentralized nature of cryptocurrencies.