Installation oracle 19c not include folder product

hi,

when i install oracle 19c windows and downlaod file WINDOWS.X64_193000_db_home.zip

i have question folder WINDOWS.X64_193000_db_home and run setup like that ;

c: WINDOWS.X64_193000_db_home> unzip \tmp\WINDOWS.X64_193000_db_home.zip

run setup as below

c: WINDOWS.X64_193000_db_home>setup.exe

and then setup oracle base into c:\Orcloptm and the result i can not see folder product

c:\orcloptm

/-- admin

/-- audit

.-- cfgtoolslogs

/-- checkpoints

/-- diag

/-- oradata

my question ?

1. can i by pass not using folder product ? and any impact performance or maintenance ?
2. that is correct or not if not have folder product ? as i understand need have folder product ?