This is not something that new users take into consideration.
I don't think most new users even know what running a full node means, let alone consider doing it. The vast majority will use a lightweight wallet such as Electrum or similar. Most good guides, including the wallet picker on bitcoin.org, only suggest bitcoin core or a similar full client for experienced users.
Every user will have their own wallet choices that suits their needs.
Why just one? The key to using wallets properly is to understand the pros and cons of each one, and use different ones in different situations. I use everything from a mobile app through to airgapped cold storage, and everything in between. The only type of wallet I don't use is a web wallet, because there is nothing they can offer that a mobile wallet can't also offer but with better security.