Planet building models do suggest free-floating exoplanets. OGLE-2016-BLG-1928 stats is difficult to pin down.
My observation. The mass of this lens event is not well determined, including the distance measurement from Earth. The arXiv paper says "If the lens is located in the Galactic disk (pirel ~ 0.1 mas), then M ~ 0.3 Mearth (which is approximately three Mars masses). The lens located in the Galactic bulge (typically pirel ~ 0.016 mas) would be more massive (M ~ 2 Mearth)...The discovery of OGLE-2016-BLG-1928 demonstrates that current microlensing surveys are capable of finding extremely -short-timescale events. Although the mass of the lens cannot be unambiguously measured, properties of the event are consistent with the lens being a sub-Earth-mass object with no stellar companion up to the projected distance of ~ 8 au from the planet. Thus, the
lens is one of the best candidates for a terrestrial-mass rogue planet detected to date. This population of low-
mass free-floating (or wide-orbit) planets may be further explored by the upcoming microlensing experiments."
A new model report for our solar system shows making Jupiter-Saturn is not easy.
https://www.sciencedaily.com/releases/2020/10/201029115802.htm, My observation, see the 35 page arXiv paper attached. A very detailed simulation model showing migration of Jupiter and Saturn, also 20 earth masses used in areas of the outer accretion disk in the solar system, the Kuiper Belt. The simulation uses 5 and 6 gas giant planets starting some 8 to 16 earth masses and caution notes in the report too. Inner solar system planets can be ejected as well
For habitable worlds it seems to be similar to real estate sales. Location, Location, Location
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