It is good to get another perspective on this topic. Obviously, you are correct that oil conditioning systems will not fix worn parts.
I think that you are confused however with the application. Your topic is varnish in steam turbines, but you discuss EHC systems - the steam turbine hydraulic system. Also, all of the issues that you raise about varnish pertain to mineral oil systems, not EHC systems which use a phosphate ester fluid. The way that deposits form in an EHC system with phosphate ester fluid is significantly different than mineral oil systems.
Obviously, you are trying to push servo-valve rebuilds. Our company has used your services before with success. However, I think that you can give us a sales pitch on your services without bashing other technologies - which are important aspects of minimizing deposit formations.
Also, your write-up of varnish is almost identical to a paper that was recently given to me by a supplier.
Please consider your services complimentary to maintaining good quality oil.