Seasonal menus are great marketing and a logistical disaster if you don't build them the right way.
The "all new" seasonal menu approach is an inventory problem wearing a creative hat. You retire four cocktails and their dedicated ingredients, introduce four new cocktails with four new ingredients, and now you have a par sheet that's partly wrong, a storage shelf full of partial bottles you over-ordered for the old menu, and a team that needs to learn a completely new set of specs during your busiest quarter transition. The menu looks fresh. The back bar is a mess.
Every new cocktail you add to the menu must share at least three ingredients with the existing menu.
This is the constraint that makes seasonal rotation sustainable. If your new summer cocktail uses your house gin, your honey syrup, and your citrus program, you're not adding inventory. You're adding a recipe. The par sheet doesn't move, the ordering doesn't change, and the storage impact is limited to one or two new items instead of four or five.
The best seasonal menus feel considered and cohesive. The overlap rule is part of why they feel that way, because when you're constrained to work with a unified ingredient library, the menu naturally hangs together rather than reading like four different concepts bolted together at a quarterly deadline.