Even those are not as waterproof as they advertise. I have water damage even in them.
But most lawn equipment connectors are not weather proof types.
I currently working on a mower with Delphi (Aptiv) terminals and connector housings which is definitely not of the sealed type. I have more problems with the F56 style female terminals with the spring hinges breaking over time creating loose connections which the problem with this mower. Fairly easy to get and replace when you have the right tools. The Gravely dealer told the customer he had to replace the complete wiring harness as the terminal weren't available which is BS.
But having the right tools is important with any terminal replacement. Just can't use just any old tool to do this work.
The dealer obviously wants NOBODY to go back to them, since they're lying to customers. EVERYTHING is available, if someone knows where to look. For almost any terminals, Del City is one distributor that sells them- I found out about them when I went to MasterCraft boat service training- someone asked the instructor where to buy the terminals for GM fuel injected engines and he mentioned this company. The trick is in using the correct crimper, as you mentioned, with the correct pressure- some companies crimp with far more pressure than hands can provide but for a small number of terminals, soldering each one makes reliability better.
One thing I hate- being lied to. If that person thought it was true, they need to learn that everything is available and that the manufacturers don't make their own small parts in most cases. The reason GM owned parts manufacturers is because they were so huge and it was cheaper to buy small parts companies than to buy from outside.
This stuff isn't weatherproof and that makes no sense to me but the application that makes even less sense is in boats- many brands still use regular butt splices, etc on harnesses and to me, using sealed should be a no-brainer.