Chelsea winning the 3 European trophies is not a big deal. Chelsea will hold that record for a long time because top clubs like Real Madrid, Manchester City, PSG, Inter Milan, and Bayern Munich will not wish to play in the UEFA Conference League competition. Manchester United will not want to follow Chelsea's footsteps to win the 3 European trophies because they won't want or wish to play in the UEFA Conference League competition.
For Chelsea this is just a routine title, I do not think they will be too proud of it. But if there is a chance to win a trophy during the season then of course it is worth taking. Chelsea did not have any problems even though they had a couple of days less rest than Betis. And even though Chelsea conceded the first goal they quickly equalized and won very confidently. Congratulations to them on the victory. Now we will see what they can show in the Champions League next season.