the issue with sqaudrons in general is that a lot of players i have found are not amazing at placing them. If you know Rhymer is going to sit at medium range and pelt you then you need to position that he can only ever move and shoot and you then respond with an attack run on him. Flight Controller A-wings/Tycho/Wedge should make short work of him if there are not any TIE advanced. For this reason I bring at least 1 TIE advanced or Vader. you have to fight squadrons with squadrons and it somehow became the norm to not run squadrons. I love it when my opponents have minimal to 0 squadrons. I get a full run of the table with Rhymer and Co to just harass ships and slow take away your redirect options and use my ships accuracy for brace.
I do agree that Auto-Includes are "bad for the game" it often means that their may be a hole in design or something is a bit undercosted. I think even if rhymer was 25pts I would still make room for him. I only really play him when I am at a tournament or practicing for one. When I am playing fun, janky lists he often isn't there.
If your buddy repeadily plays rhymer against you, ask him what he thinks his weaknesses are. What he thinks the best counters are. If your opponent is a good sport he will tell you as he will also need the practice against seasoned players who can deal with rhymer.
In the Imp vs Reb game, I typically dont even use rhymers ability. It gives me one turn to hit at medium and then I typically stay at short range anyway to offset evade tokens. Plus the closer I get the more chance i have of my opponent overlapping my squadrons and then I can place them to shoot next turn which lets me move after attacking and reset the overlap predicument. Rhymer really enables me for the turn 2 attack instead of turn 3 and then lets me correct any mistakes I make. Can I not get to short range without him, but I can make it to rhymer? That was a positioning mistake on my part and hes a safety net. Yes he is brutal, but so is Yavaris/Gallant Haven ace builds. I would hate to deal with gallant haven without rhymer. It is almost impossible.
