Can you explain where you think the Baha'i Faith gives unclear and unproven interpretation of Quranic verses such as what you believe are the clear verses about the day of judgment? What does the Qur'an say about the Day of Judgment? I can explain what the Baha'i Faith says, but first I'd like to hear from you.
Sure, let's talk about it from "proof" standpoint.
The Signs have different stages, miracles of Moses were clear, but there will still room of denial if you are going to be that irrational. However, when you combine all the verses of the day of judgment, you can see that day, everything is proven beyond doubt that there is no room for a soul to deceive itself and deny. When disbelievers were asking for a clear sign, they were asking for that which will make them certain beyond doubt as they were accusing Mohammad (s) of sorcery or they were done through Jinn while he was possessed with respect to his signs just as past Messengers were accused of either of the two.
It's in this dialogue that Quran introduces the day of judgement as a day that everyone will see the truth clearly, but, repenting is too late on that day. God will rhetorically ask them who is the enchanter, as it will be clear that power belongs to God wholly, and this will be a clear display of signs that no one will doubt.
The Witnesses and Prophets will hold everyone accountable on behalf of God, and there are many verses about how people will wish they followed the Messengers that day, but it's too late. They will see the punishment and wish they can come back and reform themselves, but it's too late.
And this in a way is an argument against the "argument from hiddenness" that God doesn't exist. Quran shows a clear reason why God doesn't show himself beyond doubt and no room for denial to everyone. On the day when there is no room for denial, there is also no room for redemption. It's too late.
As for why the signs that type Messengers show in form of miracles are not in the open in any given time, there is only one reason to not send with them, the previous denied them and their denial made the situation hard on believers that God out of mercy for them and for humanity not to be destroyed, hides miracles from the open. Otherwise, miracles, are meant to be in the open and there is always a guide for every people that can perform them in which it proves him being a representative of God.
The difference in this age, is that, we have to ask God to guide us to see this guide and that he will manifest miracles to us if we are ready.