I stake Tezos, Cosmos, Tron and NEO in Atomic Wallet. Atomic Wallet supports staking for 8 coins. Cardano staking will be supported soon and more will come in the future.
Agree, with you how far the wallet will be supportive because of each company is providing heir own wallets. Firstly, while using thrid-party wallets we need to check about the security because there are many wallets with the negative feedback.