Did Eth have the kind of network problems at the beginning of development that happened to Solana and Harmony?
No if I am not wrong, ETH has/have lot of issues but its keep on running but only the users and the developers who is running projects on the decentralization blockchain of ethereum network is suffering. Vitalik had sich futuristic vision in the beginning of cryptocurrency era which is the main reason why it is still successful. Now ETH 2.0 is the next big update which may kill all the other dApp blockchain or atleast what the ethereum Holders claim.