I support the status quo too, but frivolous/vexatious claims can be a problem, particularly in the voluntary/charitable sector, where budgets are tight and organisations often cannot afford expert advice, especially when, as you say, there is no prospect of recovering costs.
An example - the advice centre where I work had to defend a claim a couple of months before Xmas from someone who argued that the failure to shortlist him for interview (for the job I got, as it happens) was discriminatory. This was on the basis that he was disabled. Now I *happen* to have seen his application form/person spec and the only thing that even hinted at his being disabled was his mentioning that he had been severely injured in an RTA several years ago. But there was nothing to indicate that he hadn't made a full recovery or that he was presently disabled. Further, he simply was not qualified for the job - and whilst this may have had something to do with his disability and may have been discriminatory (job is a welfare benefits casework supervisor funded by the Legal Services Commission - the LSC requires that the post holder meets the supervisor standard and the supervisor standard requires that the worker has done a set number of cases covering different aspects of social security law and has done x number of hours social security casework - all within the last 12 months) that was nothing to do with the employer - if he had any argument it is with the standards required by the LSC.
But it turns out that the thing still gets to tribunal and the director spends two days at the hearing. Also perhaps another week in preparation (always takes longer when you're not an employment specialist and cannot afford the services of an employment solicitor) - all of which is time down the drain for an organisation that is surviving on a shoestring (there were two months last year where we couldn't be paid on time and had to wait for a month 'til the budget improved). Worse, of course, he could have won or the trustees could have decided to settle for fear of losing. The bloke also turns out to be a serial complainant - this was the third claim he had made on the exact same grounds, though the previous two chose to settle.
One of the real problems with this kind of thing as I see it is that it is, of course, grist to the mill for those who wish to attack workers' rights.