AFAIK no modern monks or scholars believe the suttas convey the words of the Buddha exactly as he said them.
At the same time, there is broad agreement that the teachings were accurately remembered and conveyed via oral transmission until they were written down, and that they have preserved the core teachings of the Buddha, (see the works of Bhikkhu Anālayo, Bukkhu Sujato, Ajahn Brahmali, Bhikkhu Bodhi, Mark Allon, Professor Gombrich and many others).
They’re not just guessing or offering subjective opinions.
You may be interested in reading “The Authenticity of the Early Buddhist Texts” by Venerables Brahmali and Sujato.
I mean, we have to start somewhere. And the suttas of the Pāli Canon (and Āgamas) are as close as we’ll come to the words of the Buddha. We’re so fortunate!
It’s our choice whether to engage the Teachings or not, but overthinking this issue won’t get us very far.