In terms of squad quality Chelsea have the better players but with less experience playing in the premier league. The current problem with this Chelsea sode is that most of the players are very young and still lack that level of experience to compete amongst the top teams in the premier league at the moment. The team needs some experienced players to guide and lead this young ones, this is not entirely Pochettino fault.
Chelsea issues is not that the players lack experience, they are just too scared of scoring and they usually feel relaxed when they are leading by a goal, they lack drives and courage to change a game. My reason for this is the fact that you can't say Sterling lacks experience but you see he still lack the finishing even the others like Enzo, Conor, Chilwell and some others. Lastly, we saw how they played Liverpool, though they still lack finishing but their performance was good.
Chelsea's decline is difficult to understand, although many say they are too young and inexperienced but I don't think that's the right reason. I suspect there are other problems that might cause the Blues' performance to plummet. Conditions in the dressing room or perhaps less harmonious management could be the main cause. There was news in several media that stated that Bruno Saltor and Claude Makalele had also left, maybe there was something wrong even though it didn't come out to the public. I think Boehly must immediately improve the non-technical side so that Chelsea's condition returns to stability.