Why oil displaced mechanical stokers in capital ships

Did the Royal Navy consider mechanical stokers for coal-fired capital ships?

Yes, but mechanical stokers became viable at the same time oil firing offered a simpler and more useful transition.

The Royal Navy appears to have examined mechanical stokers rather than ignoring them entirely. The timing worked against adoption. As powered coal handling matured, oil firing also became a practical option. Oil was easier for a navy to handle and offered enough operational advantages that investment shifted toward changing fuel instead of mechanizing the old system.