it depends a bit...
For furniture, I dont think that you would find 60-70mm restrictive. Boards that are thicker than a couple of inches are harder to get anyway, you would need to search them out. Even for a hefty dining table wouldn't need to go above that. If you did need to cut something deeper, then you always have the option of a handsaw, particularly for cross cutting. If you do a lot, I would be looking at a track saw or circular saw to supplement the table saw rather than struggling with hefting massive boards to a saw. Bigger depths of cut mean bigger lumps of wood so need larger tops.
do you have a bandsaw? The only significant time that I would cut deeper than 60mm would be if I have a 50mm x 200mm board and want to split it into 2 x 25mm thick ones (this isnt a discussion on whether that is a good idea from a movement point of view). Again, you could use a handsaw which is a workout but is an option.
If you have a barn and no shortage of space, I would consider the deepest cut and the biggest saw that you can get with a nice large top and a sliding table. If you are working in a garage I would stick with the 65mm.
table saws are space hungry, have you considered not having one? This will depend on what you are making, but there may be alternatives.