Gasless trading in DeFi: useful infra or just another centralization tradeoff?

So my question is does gasless trading actually work in DeFi without just recreating a centralized relayer layer it sounds great on paper, especially if more trading gonna be done by bots/agents instead of people clicking through wallets all day. but then someone still has to pay gas, route the tx, handle execution, maybe sponsor fees, maybe abstract away native tokens, etc.

So what’s the cleanest version of this in practice? is the answer account abstraction/paymasters, intent-based systems, solvers, aggregators, or something more like advanced execution infra for limit orders/twaps/stop losses?