That is what online reviews are for.

And oftentimes, download the user manual. If at all possible, I download the manual before making any purchase decision. It can answer questions such as: What’s included in the box? What cables/accessories will I need? Will the specs be fit for purpose?

User manuals are unbiased and usually a very accurate way to figure out lots of things about a product, especially something complicated and/or expensive, before purchase.

Unfortunately I have seen companies who are paywalling or purchase-walling manual downloads.