I agree that to check the work of the DEX it is better to use new wallet. A new platform does not attract a lot attention but when it becomes popular it attracts a lot of attention including the attention of hackers.
Money always attracts attention of hackers. When wallet or DEX attracts a lot of attention and there are a lot of money hackers always pays attention to this wallets.
Security is an important part of every DEX protocol. Cross-chain transactions continue to be very risky for people and many users continue to lose money because of the problems with cross-chain bridges and protocols.