LOL
1. There are no hard and fast "rules for witnesses to testify" during an impeachment vote. The Senate can do it any way they want.
2. The Senate has the absolute power to confirm or deny appointments to office; and how they do it is entirely up to them. I've pointed this out time and again. They can hold lengthy hearings; they can hold abbreviated hearings; they can hold no hearings and either vote by acclamation, or just do nothing until the President withdraws the nomination and submits a new one. In which case all those options still remain available.
3. BOTH Parties argue over the value of the filibuster from time to time.
4. BOTH Parties do their best to "obstruct" efforts by the other Party when it comes to issues/actions they oppose. That's politics.
None of those "accusations" equate to trying to change the rules, they have always been options for either party to use when they hold all the cards.
On the other hand, trying to undermine the SCOTUS via term/age/etc. limits would require a Constitutional Amendment. Trying to "stack the court" by appointing as many judges as a Party wants to insure their power goes unchallenged is trying to change the rules by completely undermining the purpose of SCOTUS. Trying to get mass-mail voting
rushed through because a Party thinks it might help their chances to get elected, despite all the problems it is showing it will cause is changing the rules.
Meanwhile, the Democrats have already demonstrated how doing this kind of stuff is short-sighted by the example already available, when they were "in power" and got rid of the rule requiring 60 votes to confirm appointments. If they had not gotten rid of that rule for political "expedience" the Republican's would not be able to confirm any of the Justices they have without "following the rules."
Try again?