And anyone saying the above statement has some backing up with facts to do if they want to maintain credibility

.45-70 has one of the most dynamic load ranges from fast and light to heavy and slow of any round in existence. Massive bullet selection owing to a cult-like following in the USA. The Marlin 1895 is a versatile package that can take the highest pressure .45-70 loads.
The only weakness I can think of is that lever gun extraction is not as positive as a CRF bolt. Nevertheless, they have proven adequately reliable for me and there's a reason it's what most alaskan guides have carried consistently over time.