Probably because the individual engineers working on Takeout care about doing a good job, even though the higher-ups would prefer something half-assed. I work for a major tech company and I’ve been in that same situation before, e.g. when I was working on GDPR compliance. I read the GDPR and tried hard to comply with the spirit of the law, but it was abundantly clear everyone above me hadn’t read it and only cared about doing the bare minimum.
Harris will be able to serve two terms. The 22nd amendment says:
The second clause applies to vice presidents taking over, but since there’s less than two years left in Biden’s term, it won’t come into effect.