Yes, TR is bigger and badder, and formerly AM4 platforms would work for the demanding task of video processing, it wasnt in contention for a serious hedt.
But I hear from actual editors champing at the bit for the 16 core R7 7nm to release in sept, that there are 3 main advantages over TR. Its faster, its faster & its faster - so much so, its more toy like specs can be overlooked or worked around or lived with.
to say tr can run a huge 256GB of ram is true, but am4's 128GB is huge too.
To say zen2 has a mere 24 lanes is to all intents, false. Those pcie 4 lanes are twice the capacity of TR's pcie 3 lanes, and four of them are multiplexed into 16 lanes - they are ~"real" lanes, unless too many are too heavily used concurrently. For most, zen2 am4 is effectively a 40 lane rig.