Actually in those 4 hours I earned 13500XP which would have been 450 gold (it was actually Tickatus, Ashes pack and 450g) compared to the 120g (from 2 dailies) + how ever much you could grind in 1 day from wins, so max 220g (if you won 30 games in 4 hours 15) and a classic pack.
This is my point of why it’s pointless to make comparisons like that, what matters is gold accumulated over time and as the dailies + weeklies get you past level 50, then equating playtime XP to gold is completely valid as each level is 4500XP and gives 150g.
That’s like saying on the old system, wins don’t equal gold > wins count towards 3 wins > 3 wins gets you 10 gold.
1700XP did earn me an extra 150g yesterday (i.e. I just ticked over a new level) but I get you’re point that it couldn’t have. You are arguing that in 1 day I would have always earned 30g on the old system, 2 days I earn nothing on the new. Whereas my point is that every 3 days, I earn 150g (new) instead of 100g (old). It’ll be different for every player and I’m definitely near the top end of “new system is better” players.
I will say it’ll be interesting to see what they’re gona do to try and keep their word of “every player will earn more gold”. That is gona take something very creative for people who used to rush to 30 every day to not be thousands of gold down and I’m looking forward to profiting from it 
You’re right it now pretty pointless to do an end of expansion grind to farm gold…
That was just playtime, although I will admit that I didn’t add it up as I was doing quests/achievements at the same time, but the 400XP per hour quoted seemed to have been accurate based on a few tests I did at the start of the expansion so I did just times the 400 by 4.25.