I don't understand the sudden and growing hate on this forum for carbon steel taps.
The issue is not the metal, but more they are not ground.
If you are actually needing to tap something even vaugely precise, the whole setup tends to matter...the tap machine, the lubricant, the correct tap (material, flutes, coating etc)...all of that.
there is a good argument on boths sides of the case.
On the one hand, if you are not a machinist, you will spend alot more time re-threading than tapping. so, the argument goes, when you do need to tap, just buy the correct tap ad-hoc. Not only is this more capital efficient, you most likely will not want to use a 'standard' tap when the time comes...reasons being there is now alot of stainless, aluminum, and castings around on modern jobs...so you might want a "correct" tap (even if on a budget).
On the other side of the argument, is that tape and dies sets actually are nothing more than glorified rethreading kits anyways, and they are good to buy because they have more complete coverages of sizes, and are more capable for more damaged work that needs more help than a normal rethreader....and there is still lots of non-precise fabwork that a farmer/homeowner/DIY guy needs to do around the property, on lawnmowers, sheet metal, furniture, fixtures...etc. And this tends to require all manner of variety.
Somewhere in between, is also the argument that having an organized set of "prblems solvers" is still agood idea even with middle/low quality tools. If for nothing else than buying indexes and machinist storage will cost more than the dang tap and die kit in blow molded case (and even then won't be better to throw in the back of the pickup). So these guys say just buy the dang kit and replace the main ones with better tools as needed.
The last voice in the discussion is the realist--who says the main issue is broken taps, not even precision. And to avoid the problems of broken taps--and the cost and work damage--you need to buy the better if not the best taps you can.
The truth for your application is probably somewhere in between all of these sides of the discussion. Frankly, I think it also depends on the price and deals you get when shopping. One can afford more mistakes and options when buying at huge discounts. When money (pricey options) or space become huge concerns, you need more quality and less tools.
Lastly, like many "pre-emptive" tool purchases, consider just taping your credit card inside an empty tap& die set. Then buy what the situation requires, when it is required. This might be the cheapest, and best, solution for many.
