With conventional solutions, their position is legitimate.
The cost of licenses
Although their functional richness is important, licenses of batch engines on the market are generally expensive and not very progressive. "Essential options" can be added, which raises the cost even higher (additional redundant server license, logging option on a standard database, etc. ).
Heterogeneity of software used
In the end, the control solution proposed is based on two, three (or more) different software programs, originally developed by different companies. These programs use separate terminologies and concepts, and do not have the same ergonomics. Therefore, staff training is cumbersome and even after this training, staff is required to go back and forth constantly between the different concepts.
Unless we carry out many projects of this kind, maintaining operational competence is almost impossible, which imposes problems for maintaining projects.
A low level of integration
Because of their different origin, software programs are not sufficiently integrated. The benefit brought by the functional richness of the different modules does not make up for the complexity of integration, sometimes by a great deal. Many specific developments are then necessary to "glue" the different modules together.