Meng Hao 'dies' repeatedly, for over a hundred years each time, making the time he's spent outside of these timeskip segments seem so minor as to be pointless.
He constantly has to rush around to save someone or something important to him which is in immediate threat of death.
His parents show up then make excuses as to why they won't help him when someone way more powerful than him is actively hunting him.
Even before all this, he never spends time with his friends/loved ones anymore. Even the comedy relief characters who are technically always with him NEVER show up. It's so desolate, lonely and boring that it raises the question of what he's even trying to do by cultivating? Does he want to just spend eternity alone, as an immortal virgin?
At the chapter I stopped reading, 700, it's been literal centuries since he's seen numerous significant people who are important to him or at least consider him important to them. For cultivators who are already hundreds or thousands of years old, this isn't as big of a deal, but many of those people were under one hundred years old when he last saw them, would they even have strong memories regarding him considering the minor amount of time they have spent together?
Long, hundred, or even thousand year timeskips can be acceptable in the right context, but he's so isolated from everyone else that it's just become boring.
She took the Evil Infant's Wheel of Myriad Tribulations because she was confident she could suppress murderous, jealous or angry urges. This is ludicrous because those are practically the only things she feels.
It's like she's asking for trouble.