Right. Problems at Chelsea FC are not just because of coaches especially Pochettino. He is being blamed unfairly. Real issue is with owner who does not let coaches make their own decisions about players. This has caused problems with team and led to bad signings.
Many bosses don't let their coaches freedom of player choice in transfer market and in 11-chosen players for each match, it's a problem but is not a biggest issue. A bigger or biggest issue in Chelsea is their club owner, a new one after Abramovich, does not give a good coach enough time to build up squad and work with players enough to gain success. If Pochettino has been given more time, like one or two more seasons, the coach would have gain bigger success with Chelsea.
Tuchel was successful because he had good team built by Lampard and got support from Abramovich. He had freedom to make important decisions. Pochettino on the other hand took over team without leaders and had less freedom to make decisions. And this is right that current board is causing problems not Pochettino. They are making bad choices that will hurt club in the future.
I disagree that Lampard built up good squad that was inherited by Tuchel. In fact Lampard has very short time in Chelsea and Tuchel simply was good with tactics and he also was lucky in that season to win Champions League with them.