Gowipe is for TH10vTH10 only in high level clans. I really don't even think that's up for debate anymore. If you see any of the 3 star guides none of them mention gowipe gowiwi or they go out of their way to discourage it. It's simply a waste and makes baby jesus cry.
I love it when our opponents use gowipe on us. It's a complete waste of an attack. Once I see them do it 3 or 4 times I know we've won the war. If they lead off with 4 or 5 non golem raids I get nervous.
A 2 star gowipe hurts the clan far more than getting 0 from a lavaloon. When I see an attack vs. a mid TH9 startup I peek in and as soon as I see it's some ####ty golem raid I shut it off. I already know the outcome. Yeah, you can do a safe gowipe late for 2 but lately we've not needed that. Why? because the other clan is still in the gowipe rut.
I don't even think these "backside hogs/loons" things are worth a damn either. I never see them work or people panic and deploy them early to save the useless 2 star raid. They'd be better quitting before getting the 2 stars, honestly. It helps morale to be able to turn a 0 or 1 into a 3 than passing on a 2 to a 3.
Crazy to just dismiss it altogether.
If they are low on higher level attacks and we haven't made much progress on their th9s, or theyve been zero starred previously by a loon or hog attack, there's absolutely a place for this - in almost every war. It's a math and statistics game, not a risk/reward game at that point. That's when I advocate using them where needed. We've needed 2 stars on TH9s in recent wars. A star in the hand is worth 2 stars in the bush.