I haven't used a surf bootie in decades.
COLD New England winters, surfing as low as -13c
I gave up the fight around 2005 and went happily to Side Zip Dive Boots.... (half the price of surf boots)
Comfortable, keep me warm and..... after a session, I unzip and step out.
Great at stumbling through rocks at low tide, and solid grip on my SUPs
These are the boots I use, but mine are only 5 mm
Yeah... water gets in... but then they are wetsuit boots