Yes, odd. Data point: me and most of my SE friends/coworkers pay for JetBrains IDEs (I was pretty deep into emacs and vim for many years prior to switching).
Are you aware that you can set the Jetbrains editor to use emacs key bindings?
[1] https://www.gnu.org/software/emacs/manual/html_node/emacs/Ke...
I know that Intellij has emacs key bindings, that's not the issue, I'm happy with the Intellij default bindings.
In Jetbrains products, I am CONSTANTLY hitting Esc to Tab to deal with the helpful predictive suggestion. I find that feature sometimes useful, so I have not turned it off. But it definitely produces a different and maybe slower experience than typing in emacs. Maybe there is a mental mode switch between typing and handling the hint?