Well, for me at least, it isn't all nostalgia. Well, most of it is, but some of it is missed opportunities.
I never had a PC Engine growing up. I was aware that it existed through magazines like C&VG and the odd imported EGM from the US, this mythical Japanese super-console which made the Amiga look like a 2600 and had almost arcade-perfect games on these little credit card things, it sounded amazing to me. I'd never even heard of the CD add-on until about a decade later. Problem was, the machine was never made officially available here ion the UK, certainly not in places li8ke Dixon's where anyone could just walk in and pick it up off the shelf (sounds so anachronistic nowadays, doesn't it?) Yes, I could have gotten one via mail-order, but only from Germany (in the days before eBay, so it would take weeks to get to me), for a premium price that my teenaged self could never afford, and only in shitty 50hz PAL format, so it became one of those unattainable things I dreamed of one day being able to play. Those were dark days indeed.
Fast forward to a few years ago, when a certain now-defunct twitch streamer was broadcasting a raffle for various prizes, including a Core Grafx unit. I won the second prize, but the first prize winner already had a Duo-R, so we swapped prizes and I finally had one - a PC Engine of my own! Of course, the composite cables that came with it were awful, especially on a HDTV, so I got a CRT from the back room which was fine, then I bought an IFU and a refurbished CD-ROM unit on eBay, then I had the whole thing RGB-modded and railbar-fixed, then I got a PVM monitor for the best picture...over the next year or so, but you get the drill. I also got loads of other stuff for my retro corner, but the point is tl;dr - I was too poor to own much of anything when I was younger, but now I'm older and slightly better off I can buy my missed childhood back, so bully for me.
Nowadays, though, I view the Sharp X68000 the same way I used to see the PC Engine - as an unattainable goal. I have no illusions of ever owning one, though, so emulation will have to do.