What is the ruling on some people limiting themselves to saying "Bismillah" only when doing something, without saying "Ar-Rahman Ar-Raheem"?

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Question : There are people who start with "Bismillah" only and do not write "Ar-Rahman."

Answer : No, the phrase should be completed, but it is permissible by way of abbreviation. The hadith

Every important matter that does not start

كل أمر ذي بال لا يبدأ فيه

Sunan Ibn Majah 1894Da'if (Darussalam)

"Bismillah" could mean starting with this word or with the entire verse, but there is no doubt that completing it is better. However, some scholars said that it is not permissible to connect "Ar-Rahman Ar-Raheem" with "Bismillah" when slaughtering an animal, because the implication of these two names is that you should not slaughter it out of mercy for it. So how can you invoke two names that contradict the action?
But it could be said: I say "Bismillah Ar-Rahman Ar-Raheem" considering that Allah showed me mercy by permitting me to slaughter it.
Is that not so? And if Allah had not permitted me to slaughter it, it would have been forbidden for me to slaughter it. For this reason, the Exalted said:

And for them therein are [other] benefits and drinks

وَلَهُمْ فِيهَا مَنَافِعُ وَمَشَارِبُ

[Ya-Sin 36:73]

Yes,

⁽⁷²⁾ And We have tamed them for them, so some of them they ride, and some of them they eat. ⁽⁷³⁾ And for them therein are [other] benefits and drinks, so will they not be grateful?

وَذَلَّلْنَاهَا لَهُمْ فَمِنْهَا رَكُوبُهُمْ وَمِنْهَا يَأْكُلُونَ وَلَهُمْ فِيهَا مَنَافِعُ وَمَشَارِبُ أَفَلَا يَشْكُرُونَ

[Ya-Sin 36:72-73]

Source قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 2847 - 4600 ما حكم اكتفاء البعض عند عمل شيء بقول بسم الله فقط بدون الرحمن الرحيم؟ ابن عثيمين — youtube.com

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