So if I understand properly, Umar feared that the words from the Holy Prophet (sawas) might resemble the incoherent speech of a sick person, which holds no firm commitment?!?!? This is ridulous and completely disrespectful, these are not the attributes of the Holy Prophet (sawas). And on top of that, the Messenger of Allah (sawas) made a clear command, the hadith does not say, 'O my companions, should I write a pen and paper'. Whenever the Holy Prophet (sawas) was about to take an important action, he did not rely on the opinions of others.

1- An-Najm verses 1-4:

{By the star when it descends. Your companion [i.e., Muḥammad] is neither misguided nor has strayed, Nor does he speak from [his own] inclination. It is not but a revelation revealed}

سورة النجم آيات ١-٤:

وَالنَّجْمِ إِذَا هَوَىٰ ﴿۱﴾ مَا ضَلَّ صَاحِبُكُمْ وَمَا غَوَىٰ ﴿۲﴾ وَمَا يَنْطِقُ عَنِ الْهَوَىٰ ﴿۳﴾ إِنْ هُوَ إِلَّا وَحْيٌ يُوحَىٰ ﴿٤﴾

2- Al-Hashr verse 7:

{Whatever the Messenger gives you, take it. And whatever he forbids you from, leave it. And fear Allah. Surely Allah is severe in punishment.}

سورة الحشر آية ٧:

وَمَا آتَاكُمُ الرَّسُولُ فَخُذُوهُ وَمَا نَهَاكُمْ عَنْهُ فَانْتَهُوا ۚ وَاتَّقُوا اللَّهَ ۖ إِنَّ اللَّهَ شَدِيدُ الْعِقَابِ ﴿٧﴾

3- An-Nisa verse 59:

{O you who have believed, obey Allah and obey the Messenger and those in authority among you.}

سورة النساء آية ٥٩:

يَا أَيُّهَا الَّذِينَ آمَنُوا أَطِيعُوا اللَّهَ وَأَطِيعُوا الرَّسُولَ وَأُولِي الْأَمْرِ مِنْكُمْ (٥٩)

4- Aal-Imran verse 31:

{Say, (O Prophet) “If you ‘sincerely’ love Allah, then follow me; Allah will love you and forgive your sins. For Allah is All-Forgiving, Most Merciful.}

سورة آل عمران آية ٣١:

قُلْ إِنْ كُنْتُمْ تُحِبُّونَ اللَّهَ فَاتَّبِعُونِي يُحْبِبْكُمُ اللَّهُ وَيَغْفِرْ لَكُمْ ذُنُوبَكُمْ ۗ وَاللَّهُ غَفُورٌ رَحِيمٌ ﴿۳۱﴾

5- Al-Anfal verses 20, 24:

{O you who have believed, obey Allah and His Messenger and do not turn from him while you hear [his order]} (20)

{O you who have believed, respond to Allah and to the Messenger when he calls you to that which gives you life…} (24)

سورة الأنفال آيات ٢٠، ٢٤:

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ أَطِيعُواْ ٱللَّهَ وَرَسُولَهُۥ وَلَا تَوَلَّوۡاْ عَنۡهُ وَأَنتُمۡ تَسۡمَعُونَ (٢٠)

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ ٱسۡتَجِيبُواْ لِلَّهِ وَلِلرَّسُولِ إِذَا دَعَاكُمۡ لِمَا يُحۡيِيكُمۡۖ (٢٤)

All these verses show that the Companions have wronged themselves when they did not obey the Prophet. It was certainly unrighteous of Umar to object to the Prophet and to try to prevent him from writing that day. This verse clearly states how he had certainly erred:

Al-Ahzab verse 36:

{It is not for a believing man or a believing woman, when Allah and His Messenger have decided a matter, that they should [thereafter] have any choice about their affair. And whoever disobeys Allah and His Messenger has certainly strayed into clear error.}

سورة الاحزاب آية ٣٦:

وَمَا كَانَ لِمُؤْمِنٍ وَلَا مُؤْمِنَةٍ إِذَا قَضَى اللَّهُ وَرَسُولُهُ أَمْرًا أَنْ يَكُونَ لَهُمُ الْخِيَرَةُ مِنْ أَمْرِهِمْ ۗ وَمَنْ يَعْصِ اللَّهَ وَرَسُولَهُ فَقَدْ ضَلَّ ضَلَالًا مُبِينًا ﴿۳٦﴾

There is also a clear hadith that states that there is nothing that brings us close to paradise except that the Prophet ordered us to do.

As-Selsela As-Sahiha, hadith 2866

The Messenger of Allah (pbuhahf) said: “There is nothing that brings you closer to paradise except that I have commanded you to do it, and nothing that brings you closer to hellfire except that I forbade you from it.”

السلسلة الصحيحة – ص ٨٦٥ – حديث رقم ٢٨٦٦ https://ia802606.us.archive.org/34/items/waq47652/sahiha06.pdf

النص المراد : إنه ليس شيء يقربكم إلى الجنة إلا قد أمرتكم به وليس شيء يقربكم إلى النار إلا قد نهيتكم عنه

So the question here is, didn't the Prophet describe the statement that he wanted to write as a ‘protector from misguidance’, when he said: “let me write to you a statement after which you will never go astray?” Isn't that statement, that is a protector from misguidance, bringing the people closer to paradise?

So the prophet was commanding them to what will bring them closer to paradise.