* there is like no source control, or if there is the source controlled thing is an unreadable artifact which generally doesn't belong in source control.
* the workflows are poorly if at all documented.
* they still require a lot of custom code but that code isn't as reusable, tested or testable * they often require a proprietary runtime, worse this may only run on windows
* they are difficult/impossible to instrument and so are difficult or impossible to monitor. Or if they do have monitoring it is going to work differently than the rest of your stack - likely using email based alerting which isn't ideal.
* the work is still 100% done by engineers either way, I've never seen a low code or DSL be picked up by non-engineers. (I am also skeptical towards DSLs)
The only tool that was semi-reasonable here was Looker which isn't exactly marketed as low code but at least in the version of the product I used did integrate with source control. Though generally the people writing lookml were still engineers.
I'm much more a fan of composable platforms that compress complexity but still make it possible to delve, customize and extend when necessary.