No kits, no packs: free legacy items for BG updates
(No cars or spiral staircases)
Pool table: along with the billiard skill like bowling and at least 3 new pool tables should be included: classic, modern and vintage.
Water slide: with Backyard SP or even Season without this item, a free update should be enough. In this case, two water slides, like bunk beds that can match with another swimming pool items like the diving boards: normal and brick/rocky.
Telescope: normal sized and not a obervatory like one. Like pool tables, at least 3 to 4 new telescopes should be added: classic, modern and vintage. Also, I would like to have microscopes using the current assets like bunk beds, there's two in the chemistry tables in BG and SE (actually I've maded two decorative MM microscopes),
Compost bin: despite the first composting bin was added with TS2 Seasons (not TS2 BG) and Sims can fertilize directly using organic scraps, the inventory control can be enhanced with a dedicated item to produce, store and even sell fertilizer instead carring dog poop until it's needed or burning the raked leaves. I think two models can be enough: a wood maded one (to match the beehive) and a plastic one, like TS2 Seasons. The drum like one from TS3 Store can be added, but as a EP new item with new gameplay and animations.
Arcade machine: again, not an oversized model like the telescope, but a arcade machine that up to 2 Sims can play. In TS3 there's 9 arcade machines, each with a different game. I think one can be enough when Sims can choose the game instead having one different for each game.
Pool table: along with the billiard skill like bowling and at least 3 new pool tables should be included: classic, modern and vintage.
Water slide: with Backyard SP or even Season without this item, a free update should be enough. In this case, two water slides, like bunk beds that can match with another swimming pool items like the diving boards: normal and brick/rocky.
Telescope: normal sized and not a obervatory like one. Like pool tables, at least 3 to 4 new telescopes should be added: classic, modern and vintage. Also, I would like to have microscopes using the current assets like bunk beds, there's two in the chemistry tables in BG and SE (actually I've maded two decorative MM microscopes),
Compost bin: despite the first composting bin was added with TS2 Seasons (not TS2 BG) and Sims can fertilize directly using organic scraps, the inventory control can be enhanced with a dedicated item to produce, store and even sell fertilizer instead carring dog poop until it's needed or burning the raked leaves. I think two models can be enough: a wood maded one (to match the beehive) and a plastic one, like TS2 Seasons. The drum like one from TS3 Store can be added, but as a EP new item with new gameplay and animations.
Arcade machine: again, not an oversized model like the telescope, but a arcade machine that up to 2 Sims can play. In TS3 there's 9 arcade machines, each with a different game. I think one can be enough when Sims can choose the game instead having one different for each game.
washers and dryers retro topload with matching dryer retro fronload for choice as well as modern 
modern sets (*topload) 
rero and modern front load 
kitchen stoves and fridge and more dishwashers 
cars 
https://i.imgur.com/yXZt2QC.jpg
