In terms of providing an actual answer here for people arriving from google, the short answer is no, left alignment does not address complicated issues with indel representation in VCF files. It does help somewhat, but there are plenty of cases where simple normalization tools do not produce a unique variant representation. (As a side note, left-aligning simple indels is an unstated convention in VCF, and in contrast, HGVS guidelines state that indels should be right-aligned in the context of the genetic transcript).

Since there is no easy answer to representing variants uniquely, the state of the art is to perform variant comparisons using haplotype-aware tools such as rtg vcfeval, hap.py, or vgraph.