Why don ́t show the actors/actress experience in roles on the Theaters (not only movies and TV-series)???

Why don ́t show the actors/actress experience in roles on the Theaters
(not only movies and TV-series)???
Many actors/actress begin at experience in Theater...
why the IMDB don ́t show this, too???
by wolfgang amadeus rheinhardt
Joined on October 30, 2017
https://getsatisfaction.com/imdb/people/wolfgang_amadeus_rheinhardt
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Jerry Orbach
http://www.imdb.com/name/nm0001583/
http://www.imdb.com/name/nm0001583/reference
"Law & Order" .... Lennie Briscoe (274 episodes, 1991-2004)

Dirty Dancing (1987) .... Jake Houseman

http://www.imdb.com/name/nm0001583/bio
Created the roles of
El Gallo in "The Fantasticks,"
Billy Flynn in "Chicago"
Julian Marsh in "42nd Street" on the New York stage.

In 1969, he won the Tony Award for Best Actor (Musical)
for his 1968 role of Chuck Baxter in
the Burt Bacharach/Hal David musical "Promises, Promises",
a stage adaptation of Billy Wilder's The Apartment (1960).
This was preceded by a
1965 Tony nomination as Best Supporting or Featured Actor (Musical)
for a revival of "Guys and Dolls,"
and followed by a 1976 Best Actor (Musical)
nomination for the original production of "Chicago."

Made his Broadway stage debut as Smith,
the Police Constable, in "The Threepenny Opera".

Jerry went to a New York acting school (Lee Strasberg - Actor's Studio)
with fellow aspiring student, Marilyn Monroe.
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Internet Broadway Database
https://www.ibdb.com/

IBDB (Internet Broadway Database)
archive is the official database for Broadway theatre information.
IBDB provides records of productions
from the beginnings of New York theatre until today.

https://en.wikipedia.org/wiki/Internet_Broadway_Database

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https://en.wikipedia.org/wiki/IMDb
The Internet Movie Database (abbreviated IMDb)
is an online database of information related to films, television programs and video games