Simply because of Solapur being a large city with a good demand both from Bangalore and Bijapur. Avoiding Solapur will be of significant trouble to passengers.
Who actually uses Basava Exp, till today it is mystery. BGK/BJP have GG exp, SUR/KLBG people has Sur-Has SF express. YG/RC has multiple option, Sur-Has SF, Bidr-Ypr Exp, etc. This train mostly acts as secondary don't know who actually uses it.
Basava can run to Solapur via BAY GDG BJP. SBC BIDR SF should run via GTL RC KLBG. Another SF to Latur via GTL, RC, VKB BIDR. All regions would be benefited
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