$35k... that's... under $500k/year in licensing they're paying? Will they take more than a $500k hit in productivity?
By HN standards, $500k isn't even the loaded cost of one intern these days in SV, but... even in the 'normal' western business world... $500k/year is likely the cost of 2-3 engineering staff. Trying to eke that much savings in the short term seems short sighted.
My comment was reaction to the fact that there is a forced migration without 1:1 parity in feature set. Most large orgs/teams in my experience heavily rely on automation that has been added over the period of time reduce the cognitive load that is accidental/side-effect. Now if you are going to force them to move; give them a migration path.
Think of this in terms of API contracts. If half of the methods in your new version are not even available; why even make the new API public?