"true in most cases" is a correct and usable phrase in written English.
You can use it when you want to emphasize that something is generally true but may not hold true in all cases. For example, "While it's true that dogs require a lot of exercise, this is not true in most cases for small breeds."
That will still be true in most cases, but in really large disasters the extra costs will be placed in another account, known as consumption of fixed capital.
The latter is true in most cases, but the ESPN Stats and Info blog points out that "Tebow last season also was more efficient than Sanchez when throwing the ball deep".
However, the assumption is often not true in most cases in practice.
However, this assumption of audio amplitude spectrum is not true in most cases due to the complicated characteristics of the audio spectrum.
The reason is that it is not true in most cases that the hardest samples will be distributed evenly among all the classes.
The same is true in most cases for the more broadly defined end points of neurotoxicity and immunotoxicity, which may be used as approximations.
It's true that in most cases of actual chemical spills or water contamination, environmental investigations do reveal something amiss.
It is true that in most cases, one intermediate layer is recommended but to achieve the optimum solution a number of different intermediate layers should be examined.
It is true that in most cases such incidents were mere political theater, but they did have the calming effect that Nezavisimaya describes and were an important diversion of public attention at key moments.
This is true because in most cases of the African context burials are given more emphasis by many people than the sickness.
Although it is true that, in most cases, HCV is not an acute life-threatening disease that demands immediate treatment, individuals cannot precisely know the degree to which their (potential) infection has progressed.
