I think Apple is recycling millions of iPhones each year when people drop the old ones off and buy a new one. There won't be massive amounts of current generation computer, phones, or tablets around for collectors.
Quite a bit of the general retro bug (to my eyes anyway) seems to be about pre 100% automation where quite a bit of homes, cars, instruments, watches, furniture, etc. were hand crafted and assembled. At least that explains the collecting of items before your time.
What I collect: 68K/Early PPC Mac, DOS/Win 3.1 era machines, Amiga/ST, C64/128
Nubus/ISA/VLB/MCA/EISA cards of all types
Boxed apps and games for the above systems
Analog video capture cards/software and complete systems