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There's nothing wrong with wanting to stick to original hardware, if you already have it or can afford to buy it.
Setting up a Pi or other single-board system as a dedicated retro game emulator is also an absolutely valid choice IMO. It's a fun, generally affordable little project that you can tinker with forever, e.g. changing cases and controllers, UI tweaks, ROM file organization, per-game settings optimization. But I don't think that it's ever been the "best" emulation option for anyone who didn't already have their heart set on "doing something fun and interesting with a Pi".
The smartphone you already have, dedicated retro gaming handhelds, Android TV boxes or sticks, and cheap/secondhand/already-owned PCs (desktop, notebook, or kiosk) all arguably match or exceed the performance and value-for-money of any Pi-based system.
Yet in any thread where someone new to emulation is asking for advice, there's always a flock of folks who suggest getting a Pi like it's the only game in town. It honestly baffles me a little. Especially because almost all of them are just running a pretty frontend over Retroarch, and Retroarch is available for virtually every modern consumer computing platform (and so are a lot of pretty frontends, if that's a selling point).
For context, I've got a dozen or so retro systems, but I prefer to emulate as much as possible.
Emulation is nice because it removes a lot of the friction between deciding I feel like playing a given game and actually playing it. Dealing with worn out controllers, dead parts, wonky connections just to squint at a fuzzy screen. I much prefer seeing it upscaled on my modern screen and grabbing whatever controller is convenient to play with