Why are solar panels bugging people - is it not nice to have redundancy and diversity in your energy supply. Perhaps fusion/anti-matter is used for the heavy industry, but residential, recreational or other facilities run off solar, or batteries, or tubs of photosynthetic genetically engineered algae separating hydrogen from water, or bacteria making diesel?
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As for ship scales, it would be nice to see the Lynx Bulk carriers back, or to see hundreds of thousands of small ships chugging back and forth between planetary surfaces and station orbits, but I don't think any of us have got the bandwidth to support all of the client positional updates, or the CPUs to support those traffic volumes.
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And if Elite's ships are too small, other space games have even tinier one man ships.

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(The one tonne of gold vs one tonne of clothes is a valid point though, you could slow traders credits/hour values right down if they had to solve an inventory management (i.e. knapsack problem) each time they docked.

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