Signal app episode part of pattern of officials using private communications for public business

Is this not done among other things to avoid documentation and recording?

"The use of the private messaging app Signal by senior Trump national security officials is only the latest episode in a long, bipartisan history of those in government using private communications platforms to conduct official business, a problem that experts say would be simple to solve.  .."

Signal app episode part of pattern of officials using private communications for public business | Just The News "Experts say that the problem should be easy to solve by creating an in-house system for secure, fast communications."