Put the Japanese draft through English and the information arrives. The grounds for a decision do not.
The Japanese page is usually complete. It carries the product, the process, the history and the reasons behind them. Put it through a translator, careful or automatic, and every sentence arrives in English — and the reader still does not know what to do with any of it.
Translation moves information. It does not make a decision possible.
The reader is not the same reader
A Japanese buyer reading your page already knows the category, the competitors and the standards. They are checking details. An overseas reader is often meeting the category for the first time, and needs the context you would never think to write down: what this is, who it is for, and why it is made this way.
Order carries meaning
Japanese business pages tend to build: the company, then the history, then the thinking, and the product last. An English-speaking reader looking for a supplier scans for the answer first. If it is on the fourth screen, they leave before they reach it.
Claims have to be legible from outside
“High quality” and “many years of experience” read as filler to someone who does not know you. A buyer needs something they can check: capacity, materials, certifications, lead times, and who actually does the work.
What to do instead
Start from the questions the reader will actually ask, in the order they will ask them, and answer each one plainly. Anything the Japanese page says beyond that can follow underneath. Translation is a step in the job. It is not the whole job.
Translation is one step. If you want the version built around the reader, see English-speaking audiences.