Having proposed internal wood-fibre based insulation and lime render to the solid brick walls of a large Victorian listed building, I have been presented with the following objections:
1) it is expensive
2) although the condensation risk calcs indicate there will be some condensation but no annual build-up (due to hygroscopic drying to the inside and outside), any peculiarities (at corners, reveals, other odd details) will result in saturation of the wood fibre board and possible undetected spread of rot throughout the walls and into vulnerable parts of the structure
3) any minor failure of the brickwork allowing rainwater ingress will have similar results
4) any future occupant painting over the wall with the 'wrong' paint will negate the 'breathability' with results as above
5) ditto airbricks being blocked, fans failing etc leading to high humidities in the building
6) why not use thermal laminate on metal framing because, not being in contact with the brickwork, it does allow it to 'breathe'; it is cheaper; it is more effective at preventing moisture from inside the building reaching the walls; and you get better U values for less space loss.
complete heresy I know and whilst the author does not agree with some / all points it does beg the question as to whether perishable internal insulation systems should remain the preserve of highly managed and monitored buildings (National Trust properties, eco-builders own homes) whilst more robust systems should be used in the vast majority of buildings whose occupants do not care about their old buildings nor understand how they work.