I think there's a lot of value to viewing the loyalty component and the reward component separately (CX explicitly does), with the former being about enticing people who are expected to fly a lot in the coming 12 months while the latter is about providing rebates for previous flying (and/or prepaying via credit card swipe fees and mile purchases for travel). XP, if properly implemented, should correlate with future paid travel.
The current situation meanwhile basically makes the previously made predictions about future travel at least temporarily invalid (I don't think it's impossible that the median XP flown by Ivory, Silver, Gold, Platinum, and Ulti among those who have flown are basically equal since mid-March). Extending status and making good on rollover is basically a call option on something approximately like 2019 coming back in the next 12 months or so. It does primarily benefit those who have stopped flying, especially on OPM (and the rollover tweak is really only a benefit to long-time Platinums), but the cost of extending status for those who don't fly is minimal (see also Hilton giving Diamond with a credit card). We'll have a good read on what AFKL see when they decide whether to repeat these next year: not repeating is either a sign that business travel is back to a level they're happy with or that they've given up hope.
For those who are still flying, that fact is exceptionally predictive and that group is the target of the double XP, regardless of their current/previous status.