I think this discussion is also related to great article from steve neff he wrote some times ago.
https://www.neffmusic.com/blog/2017/08/finding-the-holy-grail-of-sax-mouthpieces/
In a way, I agree with everything that was said here, but I don't think it apply to everyone. I myself is nowhere near a pro level, and more importantly I don't aspire to be. Saxophone and Jazz is truly a passion dear to be, but it is one where I can only squeeze some 15 minutes sessions between going back home from work and taking care of my baby, and few hours on the week-end. I don't aspire to ever reach the toes of Sonny Rollins, I just want (and I do) to enjoy playing.
So in that regard, I got Mark great 10MFan Robusto few years ago, and I loved (still do) it and I felt really at home with it. Yet, I still got a classic when he released it, and I also love this one. Now it's itching me to get something more gritty, and so I look around, I listen to some players, read reviews and discussions here, my heart goes toward the Phil-tone Impulse, some Theo Wanne, or a Black Widow... and so on.
Is it necessary? Is it even productive in order for me to progress? I agree with Phil Barone probable answer in that regard: No. Probably that the best way for me to improve would have been to stick to just the first great mouthpiece I had and stop trying other stuff after that. But I'm aware of that. I still enjoy the chase, I still enjoy the discovery of something new, I enjoy switching gear and getting a different feel, a different sound and I have the money for it, so why shouldn't I? That pleasure and excitement in a way help me to do the extra effort to play as much as I can in a tight planning, because I don't want to put down my horns.
I'll never be a pro, I know that what matters is my own sound, my own melodic ideas, and that equipments does not matters as much: yet, wether I need it or not (I don't), wether it improves dramatically my sound or not (it won't) if tomorrow I have enough money to trade my already very nice Yanagisawa for a high end Selmer Tenor, I would without hesitation. Because I love to have something of such high quality in my hands, because I truly appreciate the passions, the dedicated hours and the craftsmanship of guys like Mark, Theo or Phil and saxophone makers at Selmer factories and I'd rather spend my money on these rather than anything else.