Take a look at this list I copied from asicminervalue.com:
Model Release Hashrate Power Noise Algo Profitability
Bitmain Antminer S19k Pro (136Th)
Apr 2023
136Th/s
3264W
75db
SHA-256
-$0.95/day
Bitmain Antminer S19 Pro Hyd (177Th)
Jan 2023
177Th/s
5221W
50db
SHA-256
-$4.04/day
Bitmain Antminer S19j Pro+ (122Th)
Dec 2022
122Th/s
3355W
75db
SHA-256
-$2.08/day
Bitmain Antminer S19 XP Hyd (255Th)
Oct 2022
255Th/s
5304W
50db
SHA-256
$0.57/day
Bitmain Antminer S19 Hydro (158Th)
Oct 2022
158Th/s
5451W
50db
SHA-256
-$5.88/day
Bitmain Antminer T19 Hydro (158Th)
Oct 2022
158Th/s
5451W
40db
SHA-256
-$5.88/day
Bitmain Antminer T19 Hydro (145Th)
Oct 2022
145Th/s
5438W
40db
SHA-256
-$6.65/day
Bitmain Antminer S19 XP (140Th)
Jul 2022
140Th/s
3010W
75db
SHA-256
$0.03/day
Bitmain Antminer S19 Pro+ Hyd (198Th)
May 2022
198Th/s
5445W
50db
SHA-256
-$3.38/day
Bitmain Antminer S19j Pro (96Th)
Aug 2021
96Th/s
2832W
75db
SHA-256
-$2.19/day
Bitmain Antminer T19 (88Th)
Aug 2021
88Th/s
3344W
75db
SHA-256
-$4.16/day
Bitmain Antminer S19j Pro (104Th)
Jul 2021
104Th/s
3068W
75db
SHA-256
-$2.37/day
Bitmain Antminer S19j Pro (100Th)
Jun 2021
100Th/s
3050W
75db
SHA-256
-$2.57/day
Bitmain Antminer S19j (90Th)
Jun 2021
90Th/s
3250W
75db
SHA-256
-$3.77/day
Bitmain Antminer T19 (84Th)
Jun 2020
84Th/s
3150W
75db
SHA-256
-$3.85/day
Bitmain Antminer S19 Pro (110Th)
May 2020
110Th/s
3250W
75db
SHA-256
-$2.53/day
Bitmain Antminer S19 (95Th)
May 2020
95Th/s
3250W
75db
SHA-256
-$3.46/day
Ignore the prices and noise levels and extraneous stuff like that and look at the date. This is the entire family of S19 miners from 2020 to now.
I am pretty sure that there are wildly different ASIC chips being used in all of these miners with different packaging sizes such as 7nm, 5nm, even 3nm maybe. But the Bitcoin Wiki page for miners is terribly outdated (partially my fault for stalling the update of new miners) and the product details are just scattered across different sections of Bitmain's website.
The data will help me answer the question: "why is Bitmain still using the S19 product line and haven't released a new miner like say S21?"