Regarding the needles my father had kidney dialysis 3 times a week for about 5 years. He had a shunt [1]. They had to switch arms eventually, but his veins held up pretty well.

In comparison, blood doping isn't done on a regular basis such as 3 times a week. And 3 times a week isn't much for a regular heroin addict (who are know to destroy their veins), either.

[1] https://en.wikipedia.org/wiki/Shunt_(medical)