1) Never knew that Putin is a tank constructor. Thanks for sharing.
2) It took up to additional 9 years to improve the previous T-72 tank to its best condition. On the other hand, T-14 was created in 2 years only. So make your conclusions
My 2 cents: the tank is too raw and it was a very stupid idea to take it to parade. Need more time to make it perfect like AK assault riffle family, R-36 Satan, Kamov Ka-52, Topol-M, SA-21 Growler, Shkval 2 etc. All those weapons are still best in the world, but their improvement took some time, which is definitely more than 2 years.
P.S.
Why America Should Really Fear Russia's Armata T-14 Tank | The National Interest