all the Allies could do was push forward. Going around the German line was not a viable option as demonstrated by the failure of Operation Market garden.

In this much you are correct

Although the Allies would look to minimize causalities there was no major strategic breakthrough. I used the Hochwald Gap and the advance of the 2nd Canadian Army to demonstrate the use of the vast amount of resources and manpower to hand rather then strategy.

I'd say you're dead wrong here. Eisenhower's 'Broad Front' Strategy was a masterpiece, all the Allied armies launching their own offensives into the Rhineland, destroying German reserves and in turn shortening the Allied front line, allowing them to launch a crossing of Rhine from north to south and overwhelm what remained of the German Army in the West. There was infact a breakthrough, which was achieved only after the Germans reserves and armies in the field had been badly depleted, a far more thorough operational method, at least IMO than the Germans'.

is it fair to make the suggestion that in mainland France through to Germany, there was no breakthrough strategies developed by the Allies?

No, I would not say it is fair. For one thing, it ignores Cobra, Totalize and Tractable in Normandy, it ignores the offensives undertaken by 3rd Army and 6th Army Group in Lorraine, which brokethrough to the Rhine in autumn 1944, and it ignores the Rhine Crossings in 1945.

I'd recommend reading TB Lynch's The Supreme Commander's Operational Approach, which you can find via google. It gives a good overview of the Broadfront Strategy, which proved to be a valid method for defeating the Reich.