What >100mbps content is there? 4K bluray just needs a bigger buffer to handle >100mbps spikes (Kodi for example offers this) and Moonlight/Apollo/etc is well into diminishing returns
4k blu-ray remuxes break 100mbps for long enough to cause problems on my TV, unless I use either wifi or the USB adapter. Others have done investigations showing in some movies the bitrate will exceed 100mbps for minutes at a time.
My 2020 LG CX has a USB 2.0 port and I get ~300mbps with a gigabit adapter, if the TV you ended up with has a USB port it's worth a try.