Is it a good design practice to place two or more germanium diodes in parallel to achieve a lower forward voltage drop? Does increased capacitance limit bandwidth? Is therefore more current needed to bias them properly?
With putting anything in parallel (cells, resistors, diodes, transistors, etc) the problem is ensuring the current is shared equally between unequal devices.
With putting anything in series (cells, resistors, diodes, transistors, etc) the problem is ensuring the voltage is shared equally between unequal devices.
How you acheive that depends on the specific application and its requirements. (Numerical requirements, no adjectives allowed : )