y’d sometimes be faffing around doing “funny” stuff, but I mostly was sticking to the “use your resources wisely or perish” mode of DND.

This is why, a letter of intent is important when recruiting for a new group. Explaining before session zero what’s your GM style and all the other important points. Beer and bretzel games are a legit way to play, but not suited for everyone, the same applies to tactical mini or to intense Role-playing. The earlier the players the better