Curious about default installation directory names

This is really more a curiosity than an problem.

Installing client 11.2 64-bit, the default directories are

ORACLE_BASE: c:\app\<username>

ORCLE_HOME:  c:\app\<username>\product\11.2.0\client_1

Installing client 12.1  64-bit, the default directories are

ORACLE_BASE:    C:\app\client\<username>

ORACLE_HOME:   C:\app\client\<username>\product\12.1.0\client_1

Any ideas why they decided to throw "\client" in after "\app"

??