Does being a Sky or Talk Talk customer restrict the ease of switching providers, because LLU phone numbers are not recognised by the wholesale checker site , so being a DV customer ( even if the phone number were initially a PSTN number that is now DV ) is the same as customers of Sky and Talk Talk , in that the phone number entry won’t work , but the address based one’s will, if you argue being on DV and being unable to use the phone number option on the DSL checker makes switching provider difficult , presumably you would also agree being a Sky or Talk Talk customer also does.
The 24 hour period is simply a recognition that new PSTN (WLR ) provides may take a day to appear , and not simply a random number .
If someone is FTTP they are not on ‘DSL ‘ , so why would they want to check their phone number on a DSL checker ?, it’s not like there is any variation in the connection speed paid for and the connection speed provided ( FTTP sync speed doesn’t vary due to ‘line length etc’ ) , BT FTTC customers on DV , can still use the address option on the checker same as LLU customers on FTTC have always had to use the address option, seems to me an equivalence between LLU and DV on non FTTP service.
