On the back of his signing as Williams' test and reserve driver, the team's technical chief, Paddy Lowe, underlined that Robert Kubica was particularly signed to make use of his experience and technical knowledge to help develop the FW41.
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This news can explain why there are constant problems with replacement parts and why there are no real upgrades during the season...Williams is really cash strapped!
"There are only three sports: bull fighting, car racing and mountain climbing. The rest are mere games!" - Ernest Hemingway
The picture for 2020 won't be much better unless they sign a whale of a paydriver.
It also illustrates how destructive to capital F1 can be. Williams Advanced Engineering would need to be an order of magnitude larger, with similar margins, to offset the loss generated by the group.