In article , "Robert L.
Oldershaw" writes:

"...auto-ionization is likely to remain the dominant source of free-
floating planets."

In a relatively short time we have gone from planets in relatively
"permanent" orbits to planets undergoing extensive "migrations" and
planets being ejected ["ionized"] from stellar systems.

Our understanding of stellar scale objects and exoplanet systems is
evolving at a remarkable pace, while the engine of particle physics is
racing in "park".

This is nothing new. It has been known for decades that a solar system
like our own is not likely to be stable on the timescale of billions of
years. The fact that our solar system is stable has perhaps a
weak-anthropic explanation (i.e. if it had been destabilized we wouldn't
be here). What is new is the ability to detect planets outside the
solar system.

Note also that auto-ionization as the main source of free-floating
planets goes against your idea that most (all?) planets are not formed
together with stars.