-snip-
Because of the reason written in the OP.
More inputs produce higher transaction size which makes the fee higher, so small inputs that can't be used alone in your typical transactions are recommended to be consolidated.
So if most of your coins have good amount, there's no need for consolidation.
Privacy issue is also covered in the OP.
Aside from everything which mentioned on first page, i can avoid bad scenario about paying very high fee when mempool is congested and i have tens or hundreds UTXO.
You donīt need more inputs if you have plenty of UTXOs with the variety of different values that allows to choose single one (or at least couple of them) to cover your current need. This is the key OPīs point.