If the British Raj never partitioned Bengal in 1905

Without partition, the Raj would still face the administrative scale and political pressures that prompted the measure, and would answer them through colonial coercion rather than democratic consent.

Question

How would the politics of the Raj change if Bengal had never been partitioned in 1905?

Short answer

Administrative and political tensions would intensify, and the Raj would seek another colonial solution rather than simply accepting the difficulties unchanged.

Notes

The 1905 partition was intended partly to make a very large province easier to administer and partly to manage growing local political pressures. Removing the decision does not remove those underlying problems. The British state might be partly democratic at home while governing its colonies as an authoritarian imperial system. A counterfactual Raj would therefore seek another administrative or coercive answer rather than respond as a representative democracy would within Britain.