First question: is the text really text?
Open the PDF and try selecting a word. If you can select and copy the letters, you have a text PDF and conversion is usually easier. If the entire page behaves like one image, it is probably a scan and you should expect OCR to be part of the workflow.
Why do tables change?
PDF is excellent at preserving a finished visual page, but it does not always store the document the way Word thinks about a document. A PDF may represent a table as positioned lines and text, while Word wants a real editable table. Complex tables can therefore need a little cleanup after conversion.
Arabic documents deserve an extra check
Arabic combines right-to-left writing with a visual order that differs from Latin text. After conversion, check headings, lists, and tables. Do not judge quality from the first simple paragraph; a page with columns or a table will reveal much more about the conversion.
What if the PDF is a scan?
When a PDF is a scan, OCR has to read the pixels and build new text. Results depend on scan quality, alignment, background noise, and language. A blurry scan cannot reasonably be expected to produce a perfect editable document in one click.
When do I recommend conversion?
Conversion makes sense when you need to edit text, reuse paragraphs, or rebuild part of a document. If your only goal is to preserve the exact finished appearance, keeping the PDF is often the better choice.
Multi-column layouts need realistic expectations
Magazine-like PDFs can contain columns, text boxes, and precisely positioned objects. A Word conversion may recover the words while rebuilding the layout differently. If editing is the goal, verify the text first and then refine the final layout instead of expecting pixel-perfect reconstruction from the first pass.