That would negate the entire purpose of the java
development program. Notice how you asked the question,
"...since most...!" That should indicate to you that not
all OS's are windows  platforms and the purpose of
java is to provide a language that can be
interpreted(or used) by all OS's. Just because a person can
program doesn't mean they will be using a computer that
will be of the Intel based family of mpu's. By doing
what you suggest would restrict many programmers work
to that platform, not to mention the compatibility
of browsers and OS's to decypher the programmers
intent.