Prop Firm Tech Stack - Broker/PSP Considerations

Anyone else finding the actual tech stack of prop firms a significant differentiator, or more often, a bottleneck? Not just the trading platform itself, but the entire back-end. I'm talking about the broker choice they use – affects spreads and slippage, obviously, but also the actual processing speed of orders. Then there's the payment service provider for deposits and withdrawals; some firms have remarkably clunky setups that add days to payouts or make onboarding a nightmare with KYC/KYB issues. Curious to hear if others are noticing these subtle infrastructure aspects as major friction points or competitive advantages when evaluating firms. It feels like some are still operating on tech from a decade ago.