Yep. Former President Gerald Ford gave a realistic assessment of impeachment, opining that impeachment is a political act that could be done for just about anything the House wants to impeach for. That's to be expected when the House gets to define what high crimes and misdemeanors mean.You are right. The House gets to determine the definition of high crimes and misdemeanors. Impeachment is a political process not a legal one. The House knows impeachment doesn't get them what they want, so they instead use the Mueller report to twist its findings as far as possible in preparation for the 2020 election. I think it is the right decision, honestly.
If Democrats impeach and then the Senate votes to keep Trump in office, the Democrats lose a big political defeat right before the election. They may try to impeach if Trump wins in 2020 just to keep Trump off balance.
Impeachment without conviction (the only kind we've had for presidents so far) operates something like a mere censure or vote of no confidence.
Federal judges have been impeached and removed from the bench, usually for corruption, bribery, etc.