The phrase "always comprehensive" is correct and usable in written English.
It can be used to describe something that consistently covers all necessary aspects or details.
Example: "The report is always comprehensive, ensuring that no important information is overlooked."
Alternatives: "consistently thorough" or "invariably complete".
For a scholar's collection is always comprehensive.
While I find value in Yelp and in free hyperlocal sites in my neighborhood, they aren't always comprehensive.
Kelkoo isn't always comprehensive; for example, a search for Michael Palin's book of his series 'Sahara' (retail price £20.00) comes up with three options (priced between £15.00 and £17.75), but omits two better deals on well known sites amazon.co.uk (£10.00 plus p&p) and bol.com (a mere £8.00 plus p&p).
Public-record caches aren't always comprehensive, and there are states whose public records we did not examine.
Records for the company listed on the public Federal Procurement Data System show that awards from DARPA make up the bulk of its federal contracting revenue, though that database is not always comprehensive.
Although the photos were never the juiciest, the recipes were always comprehensive and were packaged with interesting articles on the science of cooking, helpful reader tips and reviews of cooking gear.
Analysis of plasma metabolomic samples by gas chromatography mass spectrometry always requires comprehensive pretreatment including oximation and silylation.
Even when flight delays do qualify for compensation, airlines are not liable for any consequential losses so always buy comprehensive travel insurance and read the small print.
Its research into the slippery question of how poor countries can grow prosperous is always more comprehensive, and sometimes more brilliant, than anything else on offer.
Just keep in mind that you may not always get comprehensive tax, insurance and estate advice from more value-priced money management operations.
The biggest weakness, however, is that the headlines are not always as comprehensive or up to date as they should be.
