Have you tried to reinstall the Macbook from scratch, installing a fresh MacOS not from a backup? It sounds like something is messing up your system. I have had problems with both Windows and Mac that has disappeared when the system is reinstalled.
The problems with Flash Player I think has something to do with Chrome not allowing Flash to play automatically as there is to many security holes in it. Adobe will stop develeping Flash player soon. And Google has made their own Flash player in Chrome for years. I have not installed Flash player on a computer, Windows or Mac for years, using Chrome when sites need Flash.
For many a Chromebook is enough today. My daughter uses one from school and it is perfect for her needs and she is using it with a iPhone and a iPad. Best is to use services that work for your needs. Google apps is perfect as it is free and many schools and businesses use it so it will not disappear soon.
I am using Googles services and Dropbox as a backup and complement to my iCloud service. Personally I like the ”ecosystem” that Apple has and it works for my needs. I have bought software for both iOS and MacOS and it would cost alot if I would switch platform. And it would be the same if I would have been switching from Windows. For me switching would cost more for software then for hardware.
I have used and tried Android but it did not fit my uses, and I use Windows in a virtual machine and have used it since DOS 4 or 5 and Windows 3, but personally I do not like it even if Windows 10 is much better.
Look for services that are crossplatform and start using them. Choose something that fits your needs. And the most important is to remember to make good backups of all your data.
Good luck
The problems with Flash Player I think has something to do with Chrome not allowing Flash to play automatically as there is to many security holes in it. Adobe will stop develeping Flash player soon. And Google has made their own Flash player in Chrome for years. I have not installed Flash player on a computer, Windows or Mac for years, using Chrome when sites need Flash.
For many a Chromebook is enough today. My daughter uses one from school and it is perfect for her needs and she is using it with a iPhone and a iPad. Best is to use services that work for your needs. Google apps is perfect as it is free and many schools and businesses use it so it will not disappear soon.
I am using Googles services and Dropbox as a backup and complement to my iCloud service. Personally I like the ”ecosystem” that Apple has and it works for my needs. I have bought software for both iOS and MacOS and it would cost alot if I would switch platform. And it would be the same if I would have been switching from Windows. For me switching would cost more for software then for hardware.
I have used and tried Android but it did not fit my uses, and I use Windows in a virtual machine and have used it since DOS 4 or 5 and Windows 3, but personally I do not like it even if Windows 10 is much better.
Look for services that are crossplatform and start using them. Choose something that fits your needs. And the most important is to remember to make good backups of all your data.
Good luck