Properly done hard chrome plating does not weaken the steel - the operative word here is PROPERLY...
Hard chrome plating is done on highly stressed carbon steel aircraft parts, without any problems.
The electrolytic chrome process liberates hydrogen from the plating solution. This hydrogen MUST be dealt with during the plating process to insure part integrity. Plated parts must be baked to drive off the hydrogen IMMEDIATELY after the plating is completed. If the hydrogen is not removed, hydrogen embrittlement of the part can occur.
The biggest problem with hard chrome plating on consumer parts, is the "low bidder". Everybody wants "cheaper" - and the plating shop can cut the price in half without the baking process.
MIL spec parts, and aircraft parts are plated to a standard that requires baking. Carriers & bolts MAY be as well, but I would want to see the certs on the parts...
Chrome carriers mat be a bit easier to clean, but other than that there is no wear advantage.
Lem