If you would change the path to /var/www/clients/client[client_username]/web[website_domain] then the site would be destroyed when a client changes its client name or when a client changes the domain name of a site, only placeholders that will never change can be used in this path. ISPConfig uses generioc ID's for this to ensure that the path never changes when a domain name is cahnged and adds symlinks on the shell for easier navigation by domain name instead.
The available placeholders are:
[client_id]
[client_idhash_1]
[client_idhash_2]
[client_idhash_3]
[client_idhash_4]
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