I agree with you on this one.

I have no idea how every company running after messaging just forgets that we use computers! Almost every messenger app out there doesn't work on desktops. A simple web app will do, but no!

iMessages are quite close to what messaging should be. They work on your (Apple) desktop, phone and tablet and sync quite well. Too bad they're only for Apple Ecosystem!

Distributed systems with distributed, synchronized state is a hard problem. Whatsapp handles 27 billion messages per day. That's almost 50x Twitter's volume. The former behaves like a switch with pretty end-points (the smartphone app), whereas the latter is a massive distributed system storing enormous amounts of state.

If Whatsapp allowed you to log-in from multiple places but didn't synchronize your state for you (i.e., see conversation history that you had on your phone after you've moved to your computer) it would be a pretty unpleasant experience. To accomplish that, the switch-like back end wouldn't be sufficient.

I'm not sure what Google Talk's traffic is compared to Whatsapp, but gtalk allows simultaneous logins across many devices and does a decent job of synchronizing messages across them -- phone, tablet, computer (though there is a slight delay depending on the volume of messages it needs to sync).

I seriously doubt Google Talk (now called Hangouts) has anywhere close to Whatsapp's traffic. But even if they did, Google can support simultaneous login with synchronized state (and server-stored state) because it's solved a lot of these big problems in the past for other products with hundreds/thousands of engineers.

you can just keep checking your Whatsapp messages on your computer right? True I'm using bluestack software.I only checking whatsapp only office hour only.

Does it do syncing?

That is, while you're having a conversation on Bluestack on your computer and then you don't get a reply for a while, and when you get a reply on your phone, you completely forget what the conversation was about: will your phone show a history of the conversation from the computer?

There's a difference! Bluestack is a workaround.

Better situation would be at least a web app. An app that integrates Whatsapp with Windows and Macs (like iMessages work on Macs) will be a great idea.