The argument in favour of the lords is it allows scrutiny on laws without party politics - if something is stupid but popular their job is to say no, when the commons would want to push it through to increase their reëlection chances. Replacing them with an elected chamber is just as bad as completely removing them in that case.
Yeah, I agree that’s not great but it’s still not a reason to risk rushing in to making it worse
Personally I think the fact it’s unelected is great, but the way people get into it isn’t so great, so would rather have reform but keeping it unelected or at most indirectly elected, with voting rights going to MBE holders (or a pool of MBE holders elected by the commons in some format which accounts for party makeup of the commons) or all Livery Company/Professional Association leaders or some other group which should know their stuff better than both the people we currently have in the lords or career politicians