You could do that if you wanted, it would take consistent re-refreshment of the dosers since those bacteria don't occur naturally in our tanks/in the levels attained by those dosers
those bacteria are often a mix of various strains doing varying jobs...nitrifiers don't degrade sludge, and sludge digesting bacteria strains don't necessarily nitrify either
water changing and detritus removal is the workaround for having to add sludge digestors
removing an invader by hand with other types of cheats are commonly used to beat invasions vs adding bacteria strains...they're not harmful to add but they don't always work for invasions so people will use a range of approaches to fight various invasions.
the reason I wont use those products is because its just easier to make the tank's natural complement of bacteria be enough, saves $ and hassle. others prefer to work less with actual physical export, and use bacteria to break down particles so that natural currents and filtrations schemes in the tank are better at export.
all those bacteria are oxygen consumers, at some point after dosing a bunch of them mixed into solution and sustaining that it becomes another loading against 02 which in the night phase might mean something. there's a bunch of various forms of these dosers coming to
market...little dissolving strips, gels etc, all the same stuff just different delivery systems. Large tanks might have a little more use for such experimentation due to inability to access the tank. nano reefers would see these dosers as optional, since 100% water change fixes any known issues and is easy to run in a nano if needed.