How critical if eNB (4G only) does not support CSFB/SRVCC?

Hi experts!

I am going to present to customer indoor solution which consist of Lte only digital DAS system.
That eNB does not support SRVCC and CSFB. Only 4G mode.

Our customer (operator) has GSM/UMTS/4G and both CS and Volte voice.

Question: do you see any use cases for 4G only indoor solution (without SRVCC/CSFB)?
Could it be considered as an additional resource pipe for already deployed indoor systems.

not support CSFB/SRVCC