Isn't part of the problem that most popular tablets/phones are single user only? Android only recently added this feature in 4.2 and iOS is (AFAIK) single user only.

Having a different login for the kids would solve the problem.

Huh? Amigas were easily expandable, at least as much as 680x0 Apples. Big box Amigas (A2000, A3000 & A4000) had a Zorro bus which took graphics cards, serial cards, video editing (Video Toaster), etc. Small box Amigas (A500, A600, A1200) has similar expansion capabilities. A500&A1000 had a zorro 1 connector on the side, A1200 & A600 had the clockport. There were also the standard external parallel & serial ports available. There are even new expansion cards being manufactured & designed today (albeit in small quantities)

My A500 had a huge 80Mb SCSI hard drive.

My A4000 had a 24bit graphics card, serial card, 68060 processor with fast SCSI and lots of RAM (60Mb :-)

My software has to speak to these things. The hardware is slow (serial) & shit.

The government doesn't even know what information we should be sending to these boxes and their guidelines are constantly changing. We've wasted 100s of man hours. Our customers are pissed off because transaction speed has dropped and they can't even print more than 1 copy of an invoice.

And at the end of the day they solve nothing.