maybe i’m insensitive (depends on who you ask 😂
but i don’t feel any “squishiness” on either of my tubeless setups and i run them at pretty low pressures.
on my aethos i started with 26mm turbo cottons, various kinds of tubes including tubolitos, aerothans, and cheap ones, 80-85 psi. hated the frequent flats.
have since run it tubeless, 28-30mm GP5000 S TR, as low as 50psi but typically 60, and while the ride is much smoother (and no ride ending flats in almost 10k miles!) i would definitely not describe it as “squishy.”