This era of tennis being weak is an old people's argument, easily disproven by the fact that players who got to play in both eras: mid to late 90's and early to mid 00's, always say the level of play was higher in newer eras.
Tim Henman, an old schooler that es about today's tennis lack of diversity and wishes tennis was more like before, still had this to say:
"When you look at it this era, Federer, Nadal and Djokovic have 36 Grand Slams among them. It's the toughest era in tennis.
I don't think (I would do well on this era), I would not win much."
https://timesofindia.indiatimes.com/...w/28598116.cms
You know why he says this, despite being an old school guy that wishes tennis was more like before? Because he got a taste of both worlds. He played against Sampras, Agassi, Courier, etc and he played against Federer, Nadal, Djokovic and Murray; and he knows, from experience, that tennis' level is at its peak, right now.