Is the Bitcoin Core One Indexing Constantly?

The Electrum one is indexing constantly, right? So that basically just indexes every transaction that comes in. The Bitcoin Core one needs to work the way it does because it doesn't index everything. It tries for very good reasons to keep your disk space spaced down. If you have the transaction ID, what it does not do is allow you to look up the balance of your address. And that's what you actually need. But a wallet can't really use that in the sense of saying, can I check my balance? Because you need to be able to look up an address, not the transaction ID.