In case Windows 95 PCs, many users need to have individual copy of web browser in local RAM and hence there is wastage of RAM space. Diskless computers are extremely fast because program loading time is completely eliminated. For example, if the server loads the StarOffice suite into memory due to request from one diskless user then if another diskless user wants to use the StarOffice suite then loading time is avoided since StarOffice is already loaded. Very few system administrators required to maitain central server unlike Windows 95 PC clients which need many administrators. Zero administration at diskless client side.
Diskless computers are absolutely maintainence free and troublefree.
Long life of diskless clients - more than 300 years without any hardware or software upgrades. The server has lots of memory and many powerful CPUs. Can operate in places like factory floor where a hard disk might be too fragile.