To add a data point from this month:

I booked a room at a UK Ibis for two people and paid in advance: most in points and the balance with my credit card. Changed plans and snow meant that my spouse would arrive in the afternoon but I wouldn't make it until very late, if at all. I therefore checked in online (something I otherwise avoid) and my spouse arrived at the hotel without me. They were given a stark choice: either wait until I arrived to access the room or convert the points booking to a cash booking and pay the amount due.

The duty manager made it clear that there were no other options. After payment was made, two room keys were issued but a drinks voucher was denied -- "the member can claim it when he checks in later".

Apparently all in accordance with the ALL rules, but it really did feel overly strict.