I do see where you are coming from, and I completely agree that unnecessary and extraneous features or tools add additional attack vectors. I've said as much before about a hardware wallet which has games on it, and about installing a bunch of other software on any device which you are using to hold large amounts of bitcoin.

However, Lightning support (for example) is neither unnecessary nor extraneous. Electrum offers a wide range of functions which many users don't use, such as multi-sig wallets, coin control, RBF, Lightning, and so on. As bitcoin develops, then more features will be implemented, such as taproot. Many people want and use these features. If you don't want these features, then don't use them. If you feel they are posing an unnecessary risk for you, then use different software or a different set up which complete mitigates such attack vectors, such as an airgapped device.