Same problem, they really need good tools to allow you to quickly review your subscriptions - there's channels in there I don't care about anymore that spam out videos making my sub tab useless. They also need to allow you to migrate your subscriptions - my account predates when they were linked to your Gmail, so my Google play music transferred to YouTube music but isn't the YouTube account I watch videos on - it's a PIA I have to switch between accounts everyone I go from music to video or vice versa.