QB Issue Resolution:

you are correct, but you can copy each year’s data into an Excel spreadsheet and have many years in that document.

Resolution for Issue 'Can I compare multiple years’ profit and losses with QB?' available: Yes (Solved).
Source: Intuit Community forum.

Can I compare multiple years’ profit and losses with QB?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for compare multiple
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