Hello,
The FFF capabilities in Fusion 360 have the same, and more, parameters for adjustment. If you find them to be weak as they are, you are advised to adjust those parameters.
If you need help or advice with that, ask in the Fusion 360 forums or consult the online help.
Furthermore, while Netfabb's FFF, even before it was finally removed, received little more than maintenance, FFF in Fusion 360 is under active development and improvement. If you find that there are functions missing or not working as desired, I strongly recommend you report those shortcomings, ideally with examples, as "supports are too weak" is unfortunately nothing substantial enough for us to investigate.
Kind regards,
Steffen