But an even smaller percentage, I presume, does like the comfort of the Electrum client, and runs a Bitcoin Core node
I always assumed there are many times more Electrum users than Bitcoin Core users, but I have no hard data on this. It's my gut feeling considering the easy of use compared to first downloading 450 GB.
Besides, what's so difficult with running a server on top of your node?
I never tried, so I don't know.