Waise to Allahabad's capacity can't be questioned as Allahabad Duronto is still one of the most successful Duronto trains in India (that too after Flexi Fare), even when Lucknow Duronto ceased to exist for reasons unknown (no offence against Lucknow though).
Allahabad does need a Premium Day Time Intercity to Delhi as it has none right now, although it shouldn't be at the cost of any City but need is a need.
Peace Bro 🙏