ethereum is a good altcoins but i don't see them transparent in development, even the rumored eth 2.0 will launch, not even launch as of today. In my opinion, the criteria as a good altcoin are having a large community, high security and adoption.
In terms of community, security, and high adoption, I think Ethereum has had it for a long time even though at this point it seems to have faded, even though it is still running so it's not worth saying that Ethereum is not transparent in terms of development, because whatever new things are always requires a more in-depth study.