With Cloud computing, why do I still need Windows 10 on my computer?

As Microsoft gets ready to blow us away with all the new and improved features of Windows 10, which we are told include the following;

• Bringing back the start menu.
• Embedding or displaying APPS in a window form rather than what it is like at the moment in Windows 8.
• Improved multitasking and multiple desktops.
• Improved command prompt (a feature that is probably rarely used now).
• And many more new or improved features.

I crave to be enlightened as to why I still need to have a fairly elaborate applications manager and locally installed applications? My questions are many and varied;

• With Cloud computing, can most of the processing of data when using office like applications not be done in the cloud, especially with the proliferation of SaaS cloud based applications such as Google Docs, data storage web sites etc?

• Is the personal computer (especially Laptops, tablet PC’s and mobile devices etc now becoming (or will become) more of “dumb devices” that simply require reasonable internet speeds, a miniature very cut down version of an operating system, computer resources to upload/download, process, format, display (according to device size) and retrieve data from the cloud?

• With the current advancement of smart mobile phone technology, is the demand simply the need to process, update information on the go, in a manner that is portable from one device to another?

• Also with cloud computing, is the cost and the effort required to develop, implement computer based applications installed locally vs SaaS cloud based applications still worth it. For example 10 to 15 years ago implementing SAP (Sales and Distribution) was not only very expensive to deploy in a corporate organisation but could take a few good months to implement, SaaS cloud CRM applications such as Sales Force now serves as a suitable cost effective alternative for small to large sized businesses.

With the rapid advancement in smart and mobile phone technology, as a user group we are probably quite spoilt now and expect our personal computer, mobile and portable devices to allow us (on the go) literally manage all aspects of our lives such as;

• Personal banking (checking the balance, transferring between accounts, paying bills etc).
• Ordering the kids lunch from the tuck shop
• Editing the PDF or Office document for my boss and sending it before 9am the next morning.
• Taking high quality pictures, video recording important moments in our lives and so on and so forth.

Microsoft’s relevance will continually rely on its speed, agility to adapt to our changing needs, expectations and real time requirements as indicated above, which so far, they have not been very successful at.

So the question is, why do I need to look forward to using Windows 10 on my personal computer or am I missing something here?