Creating all that power on the back end means you need a thin client that can decode the information. Many thin clients are sophisticated devices. Some have hardware encode and decode capabilities, such as H.264, so they don't rely entirely on the CPU. Furthermore, by working in conjunction with the remote protocols, thin clients are able to off-load much of the stress to a hardware-level decoder. Together, all those technologies deliver a modern desktop experience on the endpoint.
2. Mobile thin clients are impossible to secure
You can look at security in a few ways. First, there's no local data stored on a mobile thin client. For example, in an imaging protocol such as PCoIP or HDX 3D, pixels that change on the screen are transferred to the endpoint, but the actual data resides in the data center. All that is returned to the server are mouse and keyboard entries over a secure channel.
The secure channels are encrypted at either 128 or 256 bits. Furthermore, you can lock the endpoint image with a file or image-based write filter and lower the attack surface by simply closing all ports except the one you want to securely communicate with the server.
The other side of security is management. For example, HP arms its products with a complete device management tool called HP Device Manager, so agents can administer endpoints from anywhere on the network -- allowing simple updates for security patches or configuration changes.
3. Thin clients deliver a poor user experience
The days when thin clients were unable to deliver a rich user experience are over, especially on a modern network infrastructure. The modern protocols from Microsoft and Citrix provide multimedia redirection, so the user gets the best experience by locally rendering video content on the thin client while simultaneously reducing the load on the server.
Other approaches include hardware off-load to the server, shared graphic encoding (such as Nvidia Grid), or hardware-assisted protocol encoding (Teradici Apex Card). These approaches provide rich graphic detail without excessive consumption of server resources. The modern thin client can use off-load technology such as H.264 decoding for stunning multimedia clarity or hardware-based protocol decoding, as with the HP t310 Zero Client using Teradici Zero Client technology.
The modern thin client user today typically experiences no latency issues with graphics, streaming, or communications in a corporate office setting. However, modern workers are often mobile and expect to be able to access their environment anytime and anyplace -- which often includes accessing multiple networks that are not managed by their company. Packet loss and network latency can be an issue.