I agree that the problems you mention are very valid, and a real issue for many older people.
But, I wouldn't discount the major benefits of internet / IT for older people who are able to make use of it. My dad is 88, he has some sight but very little (registered severely visually impaired), has rheumatoid arthritis, and has used hearing aids since early middle age.
He'd be absolutely lost without the internet & the tech he uses. He can't drive any more (obviously!) so shops online. It's much easier for him to phone or message by using voice commands to Siri on the iphone (much better than the android alternative in his experience) rather than trying to dial on the landline. He's also got the iphone set up so that it answers automatically after 10 seconds unless he dismisses it.
He has just got new hearing aids that he can control (using Siri / voice again) to give the best response in all sorts of weather / social conditions, and says his hearing in crowds is better than it's been since his 40s. They also charge using a docking station rather than having fiddly batteries.
He can't read print (even large print - and when he could the limited range was frustrating), but he can read Kindle books on a large format kindle fire with the text set to a size / font that works for him. He can also have the same books on audio, and they will synchronise so that if his eyes are tired he can switch format. He also spends a LOT of time listening to music on Spotify which he can if he wants stream directly to his hearing aids.
Obviously all this is dependent on him being someone who is willing / able to engage with tech - while he left school at 16, he always had jobs that involved machinery & is very up for learning new things. And, absolutely critically, none of the above is cheap, so if he didn't have a good pension he wouldn't be able to access any of this stuff. (Though on a positive note he tells me that some friends have got equally up to date hearing aids through the NHS which is great)
So I guess it's a mixed picture, not all good but not all bad either.