imho the chrono changes are kinda meh, yes it will buff support chrono a bit but it doesn't solve the problem that chrono lost crit cap as the 5% increase went to virtuoso only and the chronomancer trait which competes with Improved Alacrity is Danger Time, which improves crit chance, so you will either have to change build again to crit cap not get the 10% multiplier on you crit damage.
Hopefully there are some undocumented changes which can make chronomancer enjoyable again.