'very consequential' is a correct and usable phrase in written English.
It is usually used to emphasize the importance or seriousness of a situation. For example, you could say, "The decisions that the Board of Directors make are very consequential and can have long lasting effects on the company."
This is a very consequential moment".
In the end, mistakes will not be very consequential.
In Texas, he has made government very consequential — for his political career.
Blamed people are often punished, which makes blame potentially very consequential for people's lives.
For all the competition for Mr. Forbes's support, though, his withdrawal may not prove very consequential.
You have an opportunity to make a very consequential decision in peoples' lives".
As privacy investigations began around the world, the company maintained that the data collection had resulted from an unauthorized project by an engineer acting on his own and that very little consequential data had been collected anyway.
If the problem is left unaddressed, cloud storage providers might fail to keep users' data secure and a large amount of private and sensitive data might be revealed with very high consequential financial, reputational and operational impact on both users and cloud storage providers.
Tax expenditures, which are also sometimes labeled loopholes, have become highly concentrated in certain areas, namely, employer-provided health insurance, the state and local tax deduction, the mortgage interest deduction, all of which are sometimes called loopholes but are in fact very serious consequential policy choices.
There was very little seriously consequential work for many years before they married.
At the level of framing a very important and consequential debate in national affairs, the government was in deliberate dot drawing mode this week.
