Allow me to explain the logic of the question:
During the time of the Sanhedrin, a Jew could be put to death for not following the law. While it was certainly enforced for things like murder, it could also be enforced for things like breaking Shabbat and idol worship. It was rare and it didn't happen often but it was still a reality that every Jew lived with.
Modern Jews have no such threat of harm to their lives. If a Jew decides tomorrow that they will not observe mitzvot any longer, they simply live life as a secular person. Other than being ostracized socially, there isn't a threat of harm against them.
Can it be argued that a Jew who is observant at a time where they face no consequence for non-observance is actually more pious than a Jew who observes out of fear of the consequences?
We are taught that the main reason we were given free will was because Hashem did not want to be worshipped by mindless drones. Hashem wanted to have us come to him freely and through our own conscious choice. Wouldn't the threat of consequences through the Sanhedrin (or any other Jewish authority) arguably cheapen the idea of true free worship?