150 E-TEC SHAFT LENGTHS

Looking at the Evinrude website I was suprised to note that the 150 H.0. only comes in a 20 inch shaft. The 2 new boats that I am looking at have transoms of 25 inches each (multi-species aluminum). It appears that the only option is the standard E-TEC. Any insight as to why?

Also, one of the boats takes up to a 175 H.P. slung on the back. Evinrude skipped over this size from 150 and went to 200. Again...why? Opinion?

Any advantage to the H.O. as compared to the standard?

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Just to avoid the inevitable, yes I saw that there is a standard 175 E-TEC. I was refering to the H.O. in 175 not being available in that line.

That is a marketing thing with BRP who knows why? Kind of like why does it take 33 oz of fluid to fill a lower unit and not 32 oz? Marketing.