No it isn't.
Projecting your knowledge into the past - and you have damn little knowledge regarding the engineering issues here other than what sounds "kewl" anyway - is what ISOTs and ASBs are all about.
.....
I'll caution you that reworking the TL to improve the capabilities of steam engines will have a myriad of knock on effects, effects which you'll need to take into account beyond "steam tanks".
But Don how can this be when in another thread you stated everything on this site is AH, including the Star Wars/Star Trek threads, the Zombie threads, the 40K board game threads and the video game based thread. Are all of those based on "plausible" changes to history?
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