Actually, electrum is one of the wallets with the most (standard but useful) features available.

A lot of wallets still don't let you select which Inputs to spend. Or to freeze inputs.
Fee estimation using the size of the mempool is not included in a lot of wallets too.

You can adjust a lot in electrum, which then offers quite some features.

Features like coinjoin and paynyms are still missing tho. However, a lot of features which aren't included in other wallets are included in electrum making it a feature-rich wallet IMO.