Why? There's no good reason to use an outdated version. Even if you aren't interested in using Lightning, version 4 and up contains a couple of other nice new features and a whole ton of bug fixes.
I keep my Bitcoin on a hardware wallet. I use Electrum together with my hardware wallet only when sending Bitcoin, and I haven't been doing much of that since the new 4.0 versions came out. I like to wait before big upgrades to give the developers some time to fix bugs and glitches. I am planning to upgrade before my next consolidation transactions.