The phrase "a matter of extensive" is not complete on its own, but it can be correct and usable in written English when part of a larger context.
You can use it when discussing topics that require a significant amount of detail, research, or consideration.
Example: "The decision to implement the new policy is a matter of extensive debate among the stakeholders."
Alternatives: "a question of considerable" or "an issue of significant".
Genome-wide association studies are just beginning to uncover novel biology; however, the functional significance of results remains a matter of extensive debate and uncertainty.
But it's also a matter of extensive public record, and even the most partisan fans may find their eyes glazing over when Harris offers play-by-play summaries of game after game, season after season after season: "The final count was 49ers 45, Cowboys 14, and it wasn't that close".
The performance of inflation-targeting regimes has been a matter of extensive research.
After the publication of the letters, Edexcel said: "Where the grade boundaries were positioned for GCSE English was clearly a matter of extensive discussion this year between exam boards and the regulator.
From there, it's a matter of extensive experimentation and practice to see what works for you.
In the last years, the role of hippocampal neurogenesis in emotional behavior has been a matter of extensive debate [8].
The higher-level phylogeny of the major arthropod groups (Chelicerata, Myriapoda, Crustacea and Hexapoda) continues to be a matter of debate despite extensive research based on phylogenetic analysis and genetic data [ 12- 14].
However, its use as a model organism for temperate cereals and forages has remained a matter of debate despite extensive international efforts that have led to the development of comprehensive genetic maps and imposing expressed sequence tag (EST) and germplasm collections.
The refurbishments would be finished "for the most part in a matter of weeks" and there were extensive plans to provide training courses, although Lambley did not say when such programs would begin.
However, the carcinogenicity of this agent and its regulation is a matter of continuing debate despite the extensive database of in vivo animal studies.
One is a matter of principle: higher taxes and more extensive regulations are an infringement of people's liberty, which may sometimes be a price worth paying for something else, such as equality, but should be questioned closely, since even in democracies such a price is generally imposed by narrow majorities.The other disadvantages are purely practical.
