I regularly post about IT matters and volunteer for a couple of charities supporting local people to use their IT devices. Although I specialise in Apple, I keep as up to date as I can with Microsoft and have a laptop which came with Windows 10 installed. I pay for Office 365 Personal, it costs me £5.99 per month and I have it running on all my 5 devices, including my iPad. I also get the free cloud storage with it.
I think something Windows users need to remember is that Windows is an operating system built for use with a variety of computers produced by different manufacturers, eg, Toshiba, HP etc. Windows has never been optimised to run on a particular device (unlike Apple who supply the device as well). So, device builds vary and, as Windows versions have changed, some devices cope better than others.
Some of the posters above have found that the demands of the Windows 10 operating system are just too great for their existing PCs. But, although you can add hard drives and run programmes that clean them up and improve things for a while, there will always be new developments that your device just can't cope with. This isn't planned obsolescence, it's just progress. Using computers is not a cheap option unless you are, or have access to, an IT specialist and don't have to pay consultation fees.
Microsoft are moving away from Windows development, it looks as if they plan to base their future on cloud services and artificial intelligence.