I thought we'd been here before ?
The LibDems did not "hold the balance of power". Because if they had even tried the Tory party would have exploded.
The split was 306/57 - so the LDs were 1/6th, not 1/2 the coalition. Very much the tail to the dog.
Also, to help with a stable government they agreed the coalition in writing so the world could rely on the UK. They could have offered a S&D arrangement, and we know how strong and stable that proved for Theresa May.
Anyway it seems we have moved on from then (I am guessing the childeren have grown up) and the LibDems are encroaching on former Tory sacred round, so revenge is definitely best served cold for them.
Really it's all an argument over how to split a bill. And as MN shows, that is far from a settled science.