Most people probably would just use Bitcoin Core alone without having to loop through an Electrum instance.
I'd say it's good if you absolutely need to use Electrum but using Bitcoin Core would be far simpler. With pruned node, you can't really scan the transactions beyond the prune limit. Anyhow, it seems to be quite limited in functionality.
I was just discussion on a similar topic with my friend and he told me that we can connect our wallet on our smartphone to use the full node on our pc.
We would be adding our transactions to the mempool ourselves. This way we won't have to rely on a third party to add our bitcoin transactions to the mempool.
Could you let me know if this possible and if yes then how can we do it ?
I use Mycelium wallet on my phone.