COBs/LEDs have a crap footprint and they cost far too much money.
The light efficiency is actually the same or worse than good quality HID's.
When COBS/LEDs can produce the same raw output across the board as HIDs and for the same price then they'll be viable, until then they're not even remotely in the same ball park.
You pay 3-5 times more money per photon of light for COBs/LEDs than decent HIDs and get shittier distribution.
It makes no sense.
1000w Gavitas are still objectively the best bang for your buck.