Is there any thing as "precedence" when we perform obligatory acts? Here, "precedence" means that one of acts that is lower in status can be skipped in favor of an act higher in status in a situation when both of them cannot be performed, although both of them is obligatory.
For example, we know that reciting Surah Fatiha in a rak'ah is obligatory. Now, while praying in congregation, it is obligatory to follow the Imam. But, I have seen recently after moving to a new country, that sometimes the followers behind the Imam who haven't finished reciting the Surah Fatihah, continue reciting it although Imam has gone to Ruku'. Sometimes, even when the Imam has gone to Sujud, they don't follow until they have finished reciting. After which they go through the "pending" prostrations and catch up with the Imam. Clearly, they have given "precedence" to reciting Surah Fatihah over following the Imam. Is there any basis for this?