They're quite different things: /etc/ld.so.conf.d/* is application specific, while any user's path depends from its environment, just like windoze (I mean the other way round, of course). To examine a user's $PATH issue
If you compare root's $PATH to that of a "normal" user on Unix, you'll usually notice a few differences...
Asus K55VD, i5 3230M - Productivity/Programming (F24)
Asus M32CD - i7-6700, Asus STRIX-GTX970-DC2OC-4GD, 1x8 GB Sk Hynix 2133 MHz DDR4 - Gaming (W10)
Asus M5A99FX Pro R2.0 - AMD FX 8350, Asus GeForce GTX760-DC2OC-2GD5, 2x4 Kingston HyperX Fury Blue 1600 MHz DDR3 - Idle
HP Proliant DL 360 G5 - Heavy lifting (CentOS 7.2)