Electrum is one of the oldest Bitcoin wallets. It was launched in 2011, and not much has changed since then. And we say that for the better!
The only thing that hasn't changed is the interface, which still looks old, but you can review the development that took place in the wallet
https://github.com/spesmilo/electrum/issues.
A lot of changes and bug fixes have occurred, and they will be one of the few portfolios that support the Lightning Network in addition to its enlarged support for bc1 address technology.
It is also one of the few wallets that enables you to use hardware wallets easily.