Truth be told, I liked the sport better when it was amateur though I'm not saying it should be again, just that I think it was better.
So you must have hated Bill Rodgers, who said "I should not lose to someone who has a full time job" or something to that effect. He and Shorter brought commercialism into distance running.
And guess what? Some runners always had advantages over others. In 1950s and 1960s, there was a question on whether athletic scholarships in the US gave unfair advantage to American athletes. Harold Abrahams was accused of having an unfair advantage because he had a professional coach back in 1924. When you were running with a pair of running shoes, there were East Africans who were running barefoot.
There has never been a level playing field, and there will never be. It is ridiculous to expect any serious athlete not to take advantage of the resources available to them. So what advantages are fair and what advantages are unfair?
If an altitude tent in cheating, how about cryosauna? Ultra sound treatment? Beetroot juice? Chocolate milk? Does every runner in the world have access to as much chocolate milk as they want?
If you think the ones you have (had) are fair, but the ones you don't (didn't) have amount to cheating, it is called hypocrisy.