... Just last year I used a ATTINY13 I'd had in a drawer for years, it's an old part that is probably considered obsolete by most but it's just as useful as it ever was and for what I needed it was more than adequate....
The ATiny13 (now ATtiny13A) is still quite useful. I went through the current AVR catalog a few months ago, and it and the ATtiny24 were the first, smallest parts that would address a design: the ATtiny24, directly, and the ATtiny13A, with a single gate, which the design needed, anyway, as a "coulomb buffer". All the rest had a least one grievous gotcha, each, that ruled them out. In this case, the ATiny13 improved on both its predecessors and successors.