Legal fees for an hour or two of advice, compared to tens of thousands of pounds at stake?
Nobody has suggested he get into a legal battle with his STBXW. People are suggesting he gets some proper legal advice about what constitutes a reasonable split of assets in their specific circumstances.
How could this not be worthwhile, for a few hundred pounds, given the sums involved and the huge implications for the futures of both parties to the divorce?
Once he has had proper advice and has a sense of what is reasonable, it is then perfectly possible to progress the divorce without further solicitor involvement if the STBXW is also minded to be reasonable and mutually agree a fair split of assets broadly in line with the legal advice.
It’s very clear advice is necessary in this case so that the OP understands the process properly i.e. which factors are relevant from a legal perspective (dependents, length of marriage, liquidity, housing needs) and which are not (e.g. whose behaviour caused the divorce) so that the OP can address the situation appropriately and suggest a reasonable division of assets, refuse any unfair demands, and ensure a financial order is in place before finalising the divorce.
It’s a false economy not to get professional advice specific to your circumstances when the cost of it would be a tiny fraction of the money that would be lost if an unfair settlement is agreed because the OP wasn’t aware of what is considered “reasonable” by the court in their particular circumstances.