I think a lot of commenters in this thread are missing an important point about accessibility. It does not just mean "works with screen readers". It means easily understood by anyone. A lot of people confuse the terms e.g. and i.e. so it is normally better to say "For example" or "That is" because these are natural phrases that will be clearly understood by a greater number of people. I try to constantly improve my w…
Many documents and websites produced by government in the UK have the "Crystal Mark for Plain English". Details at [1]. I don't notice the difference, but non-natives have occasionally said they've been surprised when certain information is clear, such as letters from a bank. [1] http://www.plainenglish.co.uk/services/crystal-mark.html
Usually the only places you still regularly saw "inst", notwithstanding and heretofore. If you wanted to understand at first reading being a contract lawyer helped.
The Plain English Campaign took out most of the low hanging fruit years back.