I believe it lacks practicality.
I mean, it might be feasible to save storage space on phones by running Bitcoin Core in pruned mode, but to validate blocks, it would need to remain constantly active.
It's a suboptimal solution, to say the least.
Run a REAL full node!
Maybe they will do it with https://zerosync.org/
But yes, you are right, it lacks of practicality, use case.
On a mobile device you should have only LN wallets not core nodes.
It might work, but I already have a hard time using it on the computer because I have to be constantly updating the entire Bitcoin blockchain, as well as on the mobile phone as well.