Electrum uses third-party servers for its work, and this is a potential attack vector.
I've never read about an attack by giving fake block information or something. The only thing I've seen is a server telling the user to download malware.
For the owner of a powerful computer, it may make sense to master the Bitcoin Core wallet. But now many users get by with a not very expensive and insufficiently powerful laptop in their work
My laptop is 9 years old, and far from powerful. But Bitcoin Core is not a problem. Have you ever used Bitcoin Core? If not, you should try it! Don't forget to enable Coin Control and walk through the options a bit, so you know what you can edit. And make a backup of your wallet before funding it.