Tamperproof receptacles aren't really a big deal in my book, they cost about what I spent anyway - a buck or so.
Tamperproof GFCI receptacles are about $21.00 vs $8.00 for standard - way out of reason IMHO. P&S does meet the wetherproof requirement with theirs though - - - but over twice the price for a piece of fancy plastic?
ARC faults - seems like requiring megging new circuits would take care of a lot of issues. The DIYers and hacks that cause issues with their wiring aren't likely to install AFCIs on their work anyhow, and would likely remove an existing one if any new work they installed caused problems. Since they are required so close to the panel even when conduit is used it basically looks like there is no confidence an electrician can install any kind of wire or cable without damage.
Requiring drilling of floor joists in crawl spaces for new work in an existing residence where NM-B is already stapled to the bottom of the joists looks like a prime area for an exception, or a requirement for new construction only - -334.15 (C)
I support most code changes but looks like lots of stupid happened this time