I concur with @
jvincent compared to my 2014 FRS my 2023 BRZ is considerably more comfortable. I do think you'll need to convince someone with one near your area to let you sit in it for a while before you'll know for sure though. My FRS had stock suspension so I am doing a stock for stock comparison. Even back in 2013 when I first test drove a FRS, it was barely tolerable for me. Had they made it as harsh as say a Acura RSX, I couldn't have it. I don't need a headache every time I drive. My issue was when road surfaces were really bad, it was pretty harsh. Only on the rare days I had a migraine driving over the bad roads where driving the car felt like punishment. Thus I did want a car that had the same traits as the old car except it eliminates this problem for me.
That said its not like the new BRZ is even midsize sedan tier of ride comfort, at best its compact car levels with IRS. I find it definitely rides better than anything with a torsion beam but the roads I drive on can be very poor and make anything with a beam suspension bounce, which I don't like, thus I refuse to own anything with that suspension.
What I can't tell you though, is whether your 2019 BRZ had enough refinement over the years that the difference is a lot smaller compared to those of us with the earliest 1st gens because I never driven a later 1st gen 86 or BRZ.
Unlike most, the comfort was what sold me on the 2nd gen BRZ. I wasn't certain what was the best route to take with a 1st gen thus I never touched the suspension on it in fear of making it worse, but for me a 2nd gen had more than enough improvements that it was worth it to me to make the leap.