Why my newly created user is not inheriting $PATH variable

I added a new user dev on my Alpine based image. After switching to the new user I see env variables are different in case of both root and dev user. Specially $PATH variable is different. But I think it should not be different as it is exported globally on /etc/profile.

$ cat /etc/profile export CHARSET=UTF-8 export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin export PAGER=less export PS1='\h:\w\$ ' umask 022 for script in /etc/profile.d/*.sh ; do if [ -r $script ] ; then . $script fi done composer(){ su-exec deploy composer.phar "$@"; } 

$PATH variable in case of root user

# env | grep $PATH PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 

$PATH variable in case of dev

# adduser -D -u 2500 -s /bin/sh dev # su dev $ env | grep $PATH PATH=/bin:/usr/bin 

I know I can add .sh inside profile.d dir and export the $PATH variable again, but why it is not inheriting as per this question (If processes inherit the parent's environment, why do we need export?)? Is there any other way I can inherit the env variables except creating a new profile for dev user ? Where those env variables has been set for dev user?