The ideal domestic pole would be a very light and very stiff 20ft pole which would be made up of 4 sections of 5ft each.
This pole due to its incredible stiffness and low weight could be used for all downstairs work but would easily reach over all conservatories etc.
Does such a pole exist? Yes I have a prototype one that I have been using for about 4 months now and it is truly awesome.
Until these poles hit the market there is always the 21ft X-Tel which is light and has shortish sections. Slightly whippy but light enough to forgive this.