Makes sense. I used the steed stone and invested a lot of leveling into stamina (plus having Kynereths blessing active most times) to acheive the same effect, but my original plan had been for light armor. However, the first set of steel plate I got was so nice once I improved it.... I caved. I kinda wish there was more benefit to light armor at low levels, but when you can totally negate the difference in movement speed... yeah, sorry, just to tempting.
Another way to look at it is to take the top perks into account rather than things like equalizing the movement speed. The Light Armor one gives a 10% chance to completely avoid a melee attack, while the Heavy Armor one deals 10% of the damage you take back at the attacker, and on Master the ability to completely dodge 10% of all attacks is
very valuable. Granted you need 100 skill, so how much of your character's career will actually see that benefit is another matter.
Of course, in trade you get to spend much of your early career significantly under-armored compared to a Heavy Armor user, and when you're in melee on Master that's pretty damn painful. Whether or not it's worth the extra abuse is difficult to assess; a sufficiently aggressive play-style will negate a goodly part of the disadvantage by keeping the opponent(s) off balance via stagger-lock, which greatly reduces the amount of incoming damage, but if you mistime an attack you may be screwed.