Hi glivo,
If you have oxy acetylene experience that would be invaluable to future tig learning.
The basic manipulations are almost identical.
Some of the best tig operators I ever knew were ex oxy welders..
However one should never think that the process is a do everything process.Like all of the other processes it has ideal applications and others were it is severely limited. Breezes and anything less than highly cleaned welding surfaces are the enemies of TIG.
As you say TIG needs those extras and for those of us with limited discretionary budgets, choices need to be made.
Grahame