While there are now X86 SBC / Mini Computers that aren't far off the Pi in price, the real benefits of the Pi aren't just the fact that it offers a certain amount of compute for a certain price.
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It's still lower power than most x86 SBCs overall, which matters with portable/remote applications
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Its schematics are usually available
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They're easy to get and have a usually guaranteed availability, so when one dies you should be able to get another
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its got a decent ecosystem around it of hardware and software, which basically nobody else can claim
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it's a fairly standard form factor, so fits into existing stuff well.
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It's likely we will see a compute module for the Pi 5 as well at a guess, which means you can treat the vanilla Pi 5 as a dev board for whatever product you're developing, and then use a potential CM5 as the core of your product once it's ready to go!
If all you need is a home server or a Linux box, then sure get an X86 SBC, but the Pi isn't irrelevant, not by a long shot! Congratulations on releasing yet another sweet spot product, I'll be picking one up as soon as I think of a use for one!