Most product reviews are made using hardware the manufacturer lent for the purpose. The unit goes back afterwards, and the relationship that made it available continues.
The dependency is structural, not stated
Nobody needs to ask for favourable coverage. An outlet that relies on loan units understands that access is granted at the manufacturer's discretion and can quietly stop.
That understanding shapes editorial decisions at the margin: which criticisms lead, how strongly a fault is characterised, whether a piece is published at all.
The effect is difficult to observe in any single review, because it operates on emphasis rather than on facts. It shows up across a body of work.
Access is the currency being exchanged
Early units, briefings and interviews all flow through the same relationship. Losing one usually means losing the others, which raises the cost of a hostile review well beyond the hardware.
For outlets whose traffic depends on being early, that cost is existential rather than inconvenient. Publishing three weeks late is not a viable business.
This is why the loudest criticism of a product frequently comes from reviewers who bought it, and why some outlets deliberately buy retail despite the expense.
Loan hardware is not always ordinary hardware
Review units are selected and prepared, and a manufacturer has every reason to send a good one. Assembly tolerance means a review sample can sit at the favourable end of the range.
Software on a loan unit may also differ from shipping firmware, with fixes applied that retail buyers receive later or not at all.
Neither practice needs to be deceptive to distort the result. Testing the best available example produces an honest report of an unrepresentative object.
Disclosure helps less than it appears to
A line stating that the unit was supplied tells the reader that the relationship exists. It does not tell them how it affected the writing, which the writer may not know either.
The useful disclosures are more specific: whether the unit is being returned, whether any conditions were attached, whether the outlet has bought retail for comparison.
Readers can also weigh an outlet's history. A publication that has published genuinely damaging reviews of major manufacturers has demonstrated where its incentives sit.
The independent alternatives are expensive
Buying every product tested is the clean solution and is affordable only at scale or with direct audience funding. Most outlets cannot carry the cost.
Some split the difference, using loan units for launch coverage and retail purchases for long-term testing, which puts the least constrained work where durability questions live.
The reader's practical response is to treat launch reviews as the manufacturer's best case, and to look for the follow-up that was made under ordinary conditions.