Have recent changes in bidding priorities changed the value of finesses?
Finesses, now as always, are worth half a trick (absent information about opponents' distributions). In IMPs scoring, it is usually appropriate to take a finesse if that is the most likely way to make your contract, and usually inappropriate to take a finesse if it risks the contract for a chance at an overtrick.

Just because a contract is less likely to make, it doesn't change the value of a finesse. If a squeeze, endplay, or combination play gives you better chances, you should do that instead of finessing. If no better alternatives exist, you should finesse.

It may be that finesses are more commonly employed by players who bid lighter games, but that doesn't reflect on their desirability.