Reed-makers do try to keep reed strengths consistent but unless you are ordering a reed set to an exact strength, you will need to do a little strength adjustment. It’s actually better for the reed to be too strong rather than too soft. A reed can be shaved or sanded to make it softer.
However, making a reed stronger is more difficult. By sending you a reed that is a little too hard, the reed-maker is actually giving you the best chance they can for you to adjust it to your perfect strength. Reed-makers supply a lot of reeds and they can’t know everyone’s personal preference (unless it’s measured and recorded). Learn to adjust your reeds and you’ll never need to rely on someone else’s idea of your perfect strength. Knowledge is power.