Dont believe it" wet grinders will not solve all your problems. Wet wheels still have the same maintenance problems as with dry grinders. e.g.: wheel need dressing and truing etc. and the wheel will need replacing every so often. Many woodturners have badly shaped tools or have bought new tools that need re-shaping, in this case the wet wheels will take considerable time to create the new edge, and also cause a lot of valuable wheel wastage.
Not everyone can justify the expense of the wet system and all the jigs. A good dry grinder will work extremely well and when you have honed the tool after grinding, the edge will be just as good as any wet wheel. As for ruining the temper: HSS will not lose the temper below red hot, but I advocate frequent dipping of the tool into water (with a little soluble oil to stop corrosion) to keep the heat down below 200 deg C or touch heat.