Courier being an elite baseliner with a backhand even Roddick memes just makes me consider the barren standards of 90s baseliners. Chang won no Slams in the 90s, Agassi was MIA for much of the 90s.
Roddick said Courier BH was ugly, not ineffective, not to mention that the guy had one of the best IO FHs ever. Agassi did waste a lot of his years in the 90s but even when he was on form and playing some of his best career tennis (like 1995) Sampras was still able to hang with him from the backcourt.
Point is, peak Sampras wasn't vulnerable from the baseline on anything but clay. This modern narrative about him being a glorified servebot who attacked the net at every opportunity is nonsense. In his best years under Gullikson he was known as the most complete player on tour, basically Fed of his time.
Sampras return stats plummeted long before being a dinosaur was a legit excuse. USO was basically won exclusively by s&v players until like 99, so while court speed matters, 90s circumstances benefitted Sampras insanely because he was the best of a player type that dominated the era, but it's ridiculous to think Sampras could do anything other than serve + pray for miracle vs Big 3.
Sampras career trajectory was very standard for players of the 80-90s era, dropping off in late 20s and peaking in early-mid 20s was the norm. Sampras wasn't really a serve and volleyer (like Edberg and Rafter), he was an all-courter.
Who knows how Sampras would develop in this era (he played with a 2 hander until he was 14) but with that serve, FH, footspeed, hands, mental toughness etc. I sincerely doubt he wouldn't be able to challenge the famed big 3 on HC/grass (even modern grass). A guy like Tsonga was able to beat all of them in slams, Sampras would be a much, much improved version of him.