TBH not many people consider SVG format worth the effort unless the graphic is made from scratch. 1) an organization rarely rationalizes having a UI dev spend 6 something hours either transforming an existing PNG to an SVG, or spending 12 hours compleitly replicate an existing design in photoshop only for it to be exportable as an SVG. I could be far fe5ching things but sometimes business or upper management get short sighted on the small things. Probably there is no rationalizarion in spending extra effort in having these graphics all svg format, thus improving your application's load and bandwidth utilization, vs pumping more funds towards other easier quicker solutions.
AFAIK, the majority of designs are created in photoshop or illustrator. No conversion nessecary. In any case, I would consider it a liability if I didn't have my designs in an editable format. What if tommorow I realized I wanted a variant in a different color? Or I decided I wanted to use a different background? If all I had was a bitmap logo, I would consider it worthwhile to have someone change it into a scalable format anyways, even if I wanted to transfer them as PNGs.
Also, numerous free tool exist to convert bitmaps to SVG. Using one of these, plus some manual smoothing and correction, I'm sure the conversion would take no more than half an hour.
