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cast-in-place side walks/walk way/foot walk------ treatment of joints

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Hello All,
The issue is the joint treatment for the above mentioned items of work. 
We have a considerable lenghts of side walks for the project. As a Contarctor we would prefer to have:
                  - minimum possible amount of joints
                  - to economise, to do away with any sealing of  joints.
For Rigid Concrete Pavement, or for that matter a slab-on-grade, sealing of grooves of  joints is understandable. That is, it is required to prevent water or dirt moving under the pavement/slab which might trigger pumping & thereby damage the subbase &  eventually the pavement/slab itself.
But for a lightly loaded pedestrian side walk,  is there really  a need to seal the joints? Given the fact that the region is arid, with very scanty rains, and the chances of water getting under is slim. But even if it gets thru, so what, its only a lightly loaded side walk.
The Consultant to the project is insisting for sealing the joints, which I feel it doesn't warrant a technical need for the same.
Any thought based on  individual experience?  Thanx in advance,
Syed Faiz Ahmad; MEngg, Masce
Senior Structural Engineer
Saudi Oger Ltd
Riyadh, Saudi Arabia.

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