I saw a Panasonic rep mention the heat sink reason in an interview a few years back, and my heart sank, concerned they would then forever abandon IBIS to get the best 4K video. Thankfully, they didn’t go that far.
As long as they don’t also do this on their cameras for stills, to which they need to add MULTI-ASPECT as well. PLEASE, Panasonic.
And they should promote multi-aspect harder, which they never have. Most people don’t know the great advantages, including artistic!
Multi-aspect should be in all mirrorless cameras. Sony is especially dropping the ball, keeping people stuck in 3:2.