In history and in current times there have always been people trying to damage the true face of the religion by trying to present false sayings/actions/events/references of the Prophet(P.B.U.H)
Exactly, enemies of Islam, munafiqs, greedy rulers, insincere scholars etc etc knew there was no way possible to change the Quran so they went after the next best thing.
which is why there is a need for the hadith to be authentic.
But unfortunately there is no bullet proof way to authenticate them.
And the incident where someone is forbidding others from narrating a hadith might be related to authenticity issues.
As for Abu bakkar R.A, lets not discuss that he might have narrated more than 40 hadiths and it is only the writers who failed to document more hadiths coming from him, but if it's 40 hadiths even then isn't it a significant number for someone who would know that Prophet(P.B.U.H) forbade narrating hadiths?
All of this is just conjecture so really point in countering this argument, but just to put it in perspective Abu Huraira who knew the prophet for only two years narrated 1000s of hadith. And Abu Huraira is a controversial figure to say the least and yet has the largest number of hadith to his credit.
On countless occasions in the Quran.
Translation: Follow Allah and his Messenger.
How do you follow the Messenger? By following what he did and said/instructed.
What is Sunnah/Hadith? Sayings and actions of prophet Muhammed(P.B.U.H).
Conclusion for those who say they only trust Quran: If you don't trust his actions/sayings/instructions then why do you trust the Quran reaching to you through his mouth?
Like I said this is the same type of argument that the shia present trying to prove imamat from the Quran by quoting out of context partial verses and twisted translations.
One example Surah nissah verse 59. The same verse latter part is O believers! Obey Allah and obey the Messenger and those in authority among you. Claiming that Allah s.w.t is referring to Ali r.a, as the authority among you. Hence imamat is proved from the Quran itself.
Like that you can take any verse or part of it out of context and make it to mean whatever you want it to, and unfortunately that is what has been going on for ages. in fact in the same surah verse 46. Allah s.w.t give the example of Jews who did the exact same thing.
"Some Jews take words out of context and say, “We listen and we disobey,” ..........playing with words and discrediting the faith."
But read the preceding verses and you get the context and situation or just even the whole verse.
O believers! Obey Allah and obey the Messenger and those in authority among you. Should you disagree on anything, then refer it to Allah and His Messenger, if you ˹truly˺ believe in Allah and the Last Day. This is the best and fairest resolution.
The preceding verses talk about Prophet Ibrahim a.s and how some people followed him and how some turned away from him and what will happen to those who did not and how to be fair and to judge in fairness and if a dispute rises among you, then refer it Allah and his messenger and those in authority.
How one concludes that this means copy cat the Prophet's s.a.w daily routines and actions as some kind of worship and part of deen or follow even today what he might have said in some situations to a certain person or group of people during his time in a certain situation, specially when there is no real credibility that these actions or saying were actually even said or done by the Prophet or said in this exact manner is beyond rationality.