Custom management software starts from your company's processes, not from a feature list. Standard software works as long as your company works the way the vendor expects. Problems start when exceptions become the rule: the workshop pricing services by model and mileage, the building services firm linking every delivery note to a work order, the jeweller tracking each piece by serial number and certificate.
Typical signs: data typed twice into the ERP and a parallel Excel file, work passing through paper or WhatsApp and then retyped, reliable numbers that only one person can produce, software that does not connect to e-commerce, CRM or e-invoicing. If you have fewer than five users and processes like your competitors', a good standard product costs less and we will say so.