Is there anything wrong/are there any problems with a person davening a long shemoneh esrei, so much so that they miss chazaras hashatz, including kedusha, and all the ameins...?
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The last sentence is crucial here in that "one should accustom oneself to concentrate while praying a bit more quickly [...] to merit responding to Qaddish".
Nevertheless, if a tzibbur prays far too quickly for one to concentrate, one should only pray as quickly as possible without sacrificing concentration.