But proper functional matchmaking is not the only solution to the skill gap problem, i still stay on the same hill that proper places to learn and practice are what makes a difficult or competitive game more enjoyable for all skill levels and that's the problem with Quake or any arenaFPS nowadays.
You make it seem like popularity and success of an online game dictate how enjoyable it will be or how accessible it will be for beginners. You literally have tons of way smaller communities of many games and genres that are not only way more accessible for beginners but almost completely focused on the competitive side, because competitiveness can be the entire point of the fun of the game, and what made these games accessible was always how easy was to learn it and find ways to help you improve rather than artificially making you win. Don't confuse competitive scenes with Esports
Also no one plays pubs in Quake as in only wanting to be competitive, if they really want to be competitive they will play duel or 2v2, people just accept that it's part of the game for it to be difficult and that if you are less experienced than the other players you will get stomped, i get stomped all the time in many matches and i have over 1000 hours, i just think it's unfair how beginners have to get out of their way just to learn movement, there isn't a single strafejump/bhop practice map built into the game, feels too archaic, and this problem is similar to many other games like these, even if different genres.
Also Quake has low playerbase but we will never be dead, smaller tournaments in all countries happen all the time and people play every single day online, updates are still being made and the game is very fun.
Feel free to hit the arena any day if you want to have some fun online and see it for yourself, people is almost never rude and plenty of people like to guide new players, you can add me on QC as "goregoregore" too although our pings will probably be too high but even then i can be fun to just mess around in a 1v1